tidy-up: miscellaneous

- drop stray duplicate empty lines in docs, scripts, test data, include,
  examples, tests.
- drop duplicate PP parenthesis.
- curl-functions.m4: move literals to the right side in if expressions,
  to match rest of the source code.
- FAQ.md: delete language designator from an URL.
- packages: apply clang-format (OS400, VMS).
- scripts/schemetable.c: apply clang-format.
- data320: delete duplicate empty line that doesn't change the outcome.
- spacecheck: extend to check for duplicate empty lines
  (with exceptions.)
- fix whitespace nits

Closes #19936

tests/sshhelp.pm

@@ -98,7 +98,6 @@ our $hstpubsha256f   = 'curl_host_rsa_key.pub_sha256';  # sha256 hash of host pu
 our $cliprvkeyf      = 'curl_client_key';        # client private key file
 our $clipubkeyf      = 'curl_client_key.pub';    # client public key file
 
-
 #***************************************************************************
 # Absolute paths where to look for sftp-server plugin, when not in PATH
 #
@@ -124,7 +123,6 @@ our @sftppath = qw(
     /opt/ssh/libexec
     );
 
-
 #***************************************************************************
 # Absolute paths where to look for httptlssrv (gnutls-serv), when not in PATH
 #
@@ -148,7 +146,6 @@ our @httptlssrvpath = qw(
     /opt/gnutls/libexec
     );
 
-
 #***************************************************************************
 # Create or overwrite the given file with lines from an array of strings
 #
@@ -174,7 +171,6 @@ sub dump_array {
     return $error;
 }
 
-
 #***************************************************************************
 # Display contents of the given file
 #
@@ -190,7 +186,6 @@ sub display_file {
     print "=== End of file $filename\n";
 }
 
-
 #***************************************************************************
 # Display first line of the given file
 #
@@ -205,7 +200,6 @@ sub display_file_top {
     print "=== End of file $filename\n";
 }
 
-
 #***************************************************************************
 # Display contents of the ssh daemon config file
 #
@@ -213,7 +207,6 @@ sub display_sshdconfig {
     display_file($sshdconfig);
 }
 
-
 #***************************************************************************
 # Display contents of the ssh client config file
 #
@@ -221,7 +214,6 @@ sub display_sshconfig {
     display_file($sshconfig);
 }
 
-
 #***************************************************************************
 # Display contents of the sftp client config file
 #
@@ -229,7 +221,6 @@ sub display_sftpconfig {
     display_file($sftpconfig);
 }
 
-
 #***************************************************************************
 # Display contents of the ssh daemon log file
 #
@@ -238,7 +229,6 @@ sub display_sshdlog {
     display_file($sshdlog);
 }
 
-
 #***************************************************************************
 # Display contents of the ssh client log file
 #
@@ -247,7 +237,6 @@ sub display_sshlog {
     display_file($sshlog);
 }
 
-
 #***************************************************************************
 # Display contents of the sftp client log file
 #
@@ -256,7 +245,6 @@ sub display_sftplog {
     display_file($sftplog);
 }
 
-
 #***************************************************************************
 # Find a file somewhere in the given path
 #
@@ -273,7 +261,6 @@ sub find_file {
     return "";
 }
 
-
 #***************************************************************************
 # Find an executable file somewhere in the given path
 #
@@ -292,7 +279,6 @@ sub find_exe_file {
     return "";
 }
 
-
 #***************************************************************************
 # Find a file in environment path or in our sftppath
 #
@@ -304,7 +290,6 @@ sub find_file_spath {
     return find_file($filename, @spath);
 }
 
-
 #***************************************************************************
 # Find an executable file in environment path or in our httptlssrvpath
 #
@@ -316,7 +301,6 @@ sub find_exe_file_hpath {
     return find_exe_file($filename, @hpath);
 }
 
-
 #***************************************************************************
 # Find ssh daemon and return canonical filename
 #
@@ -324,7 +308,6 @@ sub find_sshd {
     return find_file_spath($sshdexe);
 }
 
-
 #***************************************************************************
 # Find ssh client and return canonical filename
 #
@@ -332,7 +315,6 @@ sub find_ssh {
     return find_file_spath($sshexe);
 }
 
-
 #***************************************************************************
 # Find sftp-server plugin and return canonical filename
 #
@@ -340,7 +322,6 @@ sub find_sftpsrv {
     return find_file_spath($sftpsrvexe);
 }
 
-
 #***************************************************************************
 # Find sftp client and return canonical filename
 #
@@ -348,7 +329,6 @@ sub find_sftp {
     return find_file_spath($sftpexe);
 }
 
-
 #***************************************************************************
 # Find ssh-keygen and return canonical filename
 #
@@ -356,7 +336,6 @@ sub find_sshkeygen {
     return find_file_spath($sshkeygenexe);
 }
 
-
 #***************************************************************************
 # Find httptlssrv (gnutls-serv) and return canonical filename
 #
@@ -376,7 +355,6 @@ sub find_httptlssrv {
     return "";
 }
 
-
 #***************************************************************************
 # Return version info for the given ssh client or server binaries
 #
@@ -437,7 +415,6 @@ sub sshversioninfo {
     return ($sshid, $versnum, $versstr, $error);
 }
 
-
 #***************************************************************************
 # End of library
 1;