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

lib/ldap.c

@@ -95,7 +95,7 @@
 #define curl_ldap_num_t    ULONG
 #else
 #define FREE_ON_WINLDAP(x)
-#define curl_ldap_num_t int
+#define curl_ldap_num_t    int
 #endif
 
 #ifndef HAVE_LDAP_URL_PARSE