easy: remove #ifdefs to make code easier on the eye

Closes #11525

lib/easy.c

@@ -168,19 +168,15 @@ static CURLcode global_init(long flags, bool memoryfuncs)
     goto fail;
   }
 
-#ifdef WIN32
   if(Curl_win32_init(flags)) {
     DEBUGF(fprintf(stderr, "Error: win32_init failed\n"));
     goto fail;
   }
-#endif
 
-#ifdef __AMIGA__
   if(Curl_amiga_init()) {
     DEBUGF(fprintf(stderr, "Error: Curl_amiga_init failed\n"));
     goto fail;
   }
-#endif
 
   if(Curl_macos_init()) {
     DEBUGF(fprintf(stderr, "Error: Curl_macos_init failed\n"));

lib/system_win32.h

@@ -42,7 +42,8 @@ extern IF_NAMETOINDEX_FN Curl_if_nametoindex;
 
 /* This is used to dynamically load DLLs */
 HMODULE Curl_load_library(LPCTSTR filename);
-
-#endif /* WIN32 */
+#else  /* WIN32 */
+#define Curl_win32_init(x) CURLE_OK
+#endif /* !WIN32 */
 
 #endif /* HEADER_CURL_SYSTEM_WIN32_H */