chkshsgr.c: use gid_t.

Author: ericonr

src/chkshsgr.c

@@ -1,10 +1,11 @@
 /* Public domain. */
 
+#include <sys/types.h>
 #include <unistd.h>
 
 int main()
 {
-  short x[4];
+  gid_t x[4];
 
   x[0] = x[1] = 0;
   if (getgroups(1,x) == 0) if (setgroups(1,x) == -1) _exit(1);