build: fix build errors/warnings in rare configurations

- vtls: fix unused variable and symbols.
- ftp: fix unused variable.
- http: fix unused variables.
- smtp: fix unsued variable.
- wolfssl: fix unused variable with !proxy.
- libssh: fix unused argument.
- curl_trc: sync guards between declaration and definition.
- curl_trc: add missing guard for `Curl_trc_ssls` when !verbose.
- curl_trc: fix errors with !http + http3.
- curl_trc: fix missing function with !http + nghttp2.
- cf-h2-proxy: disable when !http + nghttp2, to avoid calling undeclared
  functions.
- sha256: fix missing declaration in rare configs.
- md4: fix symbol conflict when building GnuTLS together with AWS-LC or
  wolfSSL. By prioritizing the latter two. AWS-LC has no option
  to disable the clashing symbol. wolfSSL does, but the most seamless is
  to skip including GnuTLS's standalone `md4.h` to avoid the clash.
- build: fix errors with !http + nghttp2.
- build: catch !ssl + ssls-export combination in source. Convert
  build-level errors to warnings.
- build: fix errors with !http + http3.
- build: fix building curl tool and unit1302 in rare combinations.
  By always compiling base64 curlx functions.

- cmake: add `_CURL_SKIP_BUILD_CERTS` internal option.
  To disable automatically building certs with the testdeps target.
  To improve performance when testing builds.
  (used locally to find the failing builds fixed in this PR.)

Closes #17962

lib/cf-h2-proxy.c

@@ -24,7 +24,8 @@
 
 #include "curl_setup.h"
 
-#if defined(USE_NGHTTP2) && !defined(CURL_DISABLE_PROXY)
+#if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_PROXY) && \
+  defined(USE_NGHTTP2)
 
 #include <nghttp2/nghttp2.h>
 #include "urldata.h"
@@ -1606,4 +1607,4 @@ out:
   return result;
 }
 
-#endif /* defined(USE_NGHTTP2) && !defined(CURL_DISABLE_PROXY) */
+#endif /* !CURL_DISABLE_HTTP && !CURL_DISABLE_PROXY && USE_NGHTTP2 */