simplify string.h inclusion

src/buildblock/getopt.c

@@ -193,20 +193,7 @@ static enum
 /* Value of POSIXLY_CORRECT environment variable.  */
 static char *posixly_correct;
 
-#ifdef  __GNU_LIBRARY__
-/* We want to avoid inclusion of string.h with non-GNU libraries
-   because there are many ways it can cause trouble.
-   On some systems, it contains special magic macros that don't work
-   in GCC.  */
-# include <string.h>
-# define my_index       strchr
-#else
-
-# if HAVE_STRING_H || WIN32 /* Pete Wilson mod 7/28/02 */
-#  include <string.h>
-# else
-#  include <strings.h>
-# endif
+#include <string.h>
 
 /* Avoid depending on library functions or files
    whose names are inconsistent.  */