build: drop unused feature macros, update exception list

- cmp-config.pl: add remaining exceptions. Sort list.

- drop unused `HAVE_SYS_WAIT_H`.
  Follow-up to 50def7c881 #13249

- drop unused `HAVE_FCHMOD`.
  Follow-up to 03cb1ff4d6 #12395

- autotools: stop promoting variables to macros:
  `USE_NGTCP2_CRYPTO_*`, `USE_NGTCP2_H3`, `USE_OPENSSL_H3`,
  `HAVE_LIBRESSL`.
  They are not used in the source.

- cmake: drop unused `HAVE_O_NONBLOCK`,
  `HAVE_DISABLED_NONBLOCKING`.

- lib: drop `NEED_MALLOC_H`.
  It was used in manual-build cases for Amiga/MS-DOS/Windows/WinCE, but
  never by autotools/cmake, thus apparently unnecessary.

- lib: drop unused `NEED_MEMORY_H`.

- lib: simplify classic mac feature guards,
  drop `HAVE_EXTRA_STRICMP_H` and `HAVE_EXTRA_STRDUP_H`.

- autotools: drop unused `HAVE_GETHOSTBYNAME` detection.

- autotools: drop unused OpenSSL feature tests:
  `HAVE_ERR_H`, `HAVE_PEM_H`, `HAVE_RSA_H`

- autotools: drop unused OpenSSL feature tests:
  `HAVE_X509_H`, `HAVE_CRYPTO_H`, `HAVE_SSL_H`.

  They performed a fallback check when the primary check missed
  `openssl/x509.h`. Though if any other prefixed headers were found,
  OpenSSL is already assumed detected.

  The fallback check was looking for 3 unprefixed OpenSSL headers, and
  if all found, marked OpenSSL found internally, but did not promote
  it to `curl_config.h` via `USE_OPENSSL`. Meaning it either didn't do
  anything or may have continued with an inconsistent state.
  Added in d99c20f628 (2008)

  At the time, there was an extra `AC_DEFINE(USE_SSLEAY, 1 ...` logic
  after this code, which kicked in in the fallback case, but that code
  was deleted in 709cf76f6b (2015)

  Follow-up to 709cf76f6b

- autotools: drop `AC_SUBST()` where the value is explicitly set anyway
  and the macro is unused.

- autotools: replace `AC_SUBST(VAR, 1)` with local variable assigments,
  where the `@VAR@` macro is unused. Also dedupe the local variable if
  there was a parallel one used for the same purpose.

- autotools: drop local feature variables that were never used.

- autotools: drop unused `CURL_CHECK_OPTION_NTLM_WB`,
  `CURL_CHECK_NTLM_WB`.
  Also stop setting unused `NTLM_WB_ENABLED` macro for VMS.
  Follow-up to 50def7c881 #13249

- autotools: drop unused `PKGADD_*`.
  Follow-up to bae0d473f5 #3331

- autotools: drop unused `CURL_NETWORK_LIBS`.
  Follow-up to 3af75e18d6 #14697

Closes #15577

.github/scripts/cmp-config.pl

@@ -34,50 +34,63 @@ if(!$cmake) {
 # this lists complete lines that will be removed from the output if
 # matching
 my %remove = (
-    '#define _FILE_OFFSET_BITS 64' => 1,
     '#define CURL_EXTERN_SYMBOL' => 1,
-    '#define CURL_SA_FAMILY_T sa_family_t' => 1,
+    '#define CURL_OS "Linux"' => 1,
+    '#define CURL_OS "x86_64-pc-linux-gnu"' => 1,
     '#define CURL_SA_FAMILY_T ADDRESS_FAMILY' => 1,
-    '#define HAVE_ADDRESS_FAMILY 1' => 1,
-    '#define GETHOSTNAME_TYPE_ARG2 size_t' => 1,
+    '#define CURL_SA_FAMILY_T sa_family_t' => 1,
     '#define GETHOSTNAME_TYPE_ARG2 int' => 1,
+    '#define GETHOSTNAME_TYPE_ARG2 size_t' => 1,
+    '#define HAVE_ADDRESS_FAMILY 1' => 1,
     '#define HAVE_BROTLI 1' => 1,
     '#define HAVE_BROTLI_DECODE_H 1' => 1,
-    '#define HAVE_DECL_GETPWUID_R 1' => 1,
     '#define HAVE_DECL_GETPWUID_R 0' => 1,
+    '#define HAVE_DECL_GETPWUID_R 1' => 1,
     '#define HAVE_DECL_GETPWUID_R_MISSING 1' => 1,
     '#define HAVE_DLFCN_H 1' => 1,
-    '#define HAVE_GETHOSTBYNAME 1' => 1,
     '#define HAVE_GSSAPI_GSSAPI_KRB5_H 1' => 1,
     '#define HAVE_INTTYPES_H 1' => 1,
     '#define HAVE_IOCTL 1' => 1,
     '#define HAVE_LDAP_H 1' => 1,
     '#define HAVE_LDAP_SSL 1' => 1,
     '#define HAVE_LIBBROTLIDEC 1' => 1,
+    '#define HAVE_LIBPSL_H 1' => 1,
+    '#define HAVE_LIBRTMP_RTMP_H 1' => 1,
     '#define HAVE_LIBSOCKET 1' => 1,
+    '#define HAVE_LIBSSH' => 1,
     '#define HAVE_LIBSSH2 1' => 1,
     '#define HAVE_LIBSSL 1' => 1,
+    '#define HAVE_LIBWOLFSSH' => 1,
     '#define HAVE_LIBZSTD 1' => 1,
+    '#define HAVE_MSH3_H 1' => 1,
     '#define HAVE_NGHTTP2_NGHTTP2_H 1' => 1,
+    '#define HAVE_NGHTTP3_NGHTTP3_H 1' => 1,
+    '#define HAVE_NGTCP2_NGTCP2_CRYPTO_H 1' => 1,
+    '#define HAVE_NGTCP2_NGTCP2_H 1' => 1,
     '#define HAVE_OPENSSL_CRYPTO_H 1' => 1,
     '#define HAVE_OPENSSL_ERR_H 1' => 1,
     '#define HAVE_OPENSSL_PEM_H 1' => 1,
     '#define HAVE_OPENSSL_RSA_H 1' => 1,
     '#define HAVE_OPENSSL_SSL_H 1' => 1,
     '#define HAVE_OPENSSL_X509_H 1' => 1,
+    '#define HAVE_QUICHE_H 1' => 1,
     '#define HAVE_SA_FAMILY_T 1' => 1,
     '#define HAVE_SETJMP_H 1' => 1,
+    '#define HAVE_SSL_ECH_SET1_ECHCONFIG 1' => 1,
+    '#define HAVE_SSL_SET1_ECH_CONFIG_LIST 1' => 1,
+    '#define HAVE_SSL_SET_QUIC_USE_LEGACY_CODEPOINT 1' => 1,
     '#define HAVE_STDINT_H 1' => 1,
     '#define HAVE_STDIO_H 1' => 1,
     '#define HAVE_STDLIB_H 1' => 1,
     '#define HAVE_STRING_H 1' => 1,
     '#define HAVE_SYS_XATTR_H 1' => 1,
+    '#define HAVE_UNICODE_UIDNA_H 1' => 1,
+    '#define HAVE_WOLFSSH_SSH_H 1' => 1,
+    '#define HAVE_WOLFSSL_CTX_GENERATEECHCONFIG 1' => 1,
     '#define HAVE_ZSTD 1' => 1,
     '#define HAVE_ZSTD_H 1' => 1,
     '#define LT_OBJDIR ".libs/"' => 1,
     '#define NEED_LBER_H 1' => 1,
-    '#define CURL_OS "Linux"' => 1,
-    '#define CURL_OS "x86_64-pc-linux-gnu"' => 1,
     '#define PACKAGE "curl"' => 1,
     '#define PACKAGE_BUGREPORT "a suitable curl mailing list: https://curl.se/mail/"' => 1,
     '#define PACKAGE_NAME "curl"' => 1,
@@ -87,6 +100,7 @@ my %remove = (
     '#define PACKAGE_VERSION "-"' => 1,
     '#define SIZEOF_LONG_LONG 8' => 1,
     '#define VERSION "-"' => 1,
+    '#define _FILE_OFFSET_BITS 64' => 1,
     );
 
 sub filter {