setenv.c (sys/types.h, stdio.h): Files included.

* setenv.c (sys/types.h, stdio.h): Files included.
        * xstrdup.c (sys/types.h): File included.
For the gcc-2.95 branch only.  Not to be migrated into the mainline tree
because it is incomplete.

From-SVN: r27736

libiberty/xstrdup.c

@@ -5,6 +5,7 @@
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
+#include <sys/types.h> /* For `size_t' */
 #ifdef HAVE_STRING_H
 #include <string.h>
 #endif