src: tidy-up conditions for CA bundle search

- delete redundant Schannel check.

- move `feature_ssl` check one level up from `FindWin32CACert()`.

- check `feature_ssl` early to skip a bunch of CA bundle search logic
  for no-ssl configurations.

Reviewed-by: Jay Satiro
Closes #14841

src/tool_doswin.h

@@ -60,7 +60,6 @@ char **__crt0_glob_function(char *arg);
 #ifdef _WIN32
 
 CURLcode FindWin32CACert(struct OperationConfig *config,
-                         curl_sslbackend backend,
                          const TCHAR *bundle_file);
 struct curl_slist *GetLoadedModulePaths(void);
 CURLcode win32_init(void);