simplify string.h inclusion

Author: KrisThielemans

src/buildblock/getopt.c

@@ -202,11 +202,7 @@ static char *posixly_correct;
 # 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.  */