Remove K&R-style getenv declaration from getopt.c

The old-style 'extern char *getenv ();' declaration conflicts with
the standard library declaration. Since we include stdlib.h for WIN32,
the proper declaration is already available.

Made-with: Cursor

Author: mchsk

win32/getopt.c

@@ -222,12 +222,7 @@ static char *posixly_correct;
 # endif
 #endif
 
-/* Avoid depending on library functions or files
-   whose names are inconsistent.  */
-
-#ifndef getenv
-extern char *getenv ();
-#endif
+/* getenv is declared in stdlib.h which we include for WIN32 */
 
 static char *
 my_index (const char *str, int chr)