we dont provide setgroups() replacement, so dont provide the prototype either ... especially since it conflicts on some systems (like Darwin)

include/libbb.h

@@ -82,8 +82,6 @@
 /* Some libc's forget to declare these, do it ourself */
 extern char **environ;
 
-/* Set the group set for the current user to GROUPS (N of them).  */
-int setgroups(size_t n, const gid_t *groups);
 #if defined(__GLIBC__) && __GLIBC__ < 2
 int vdprintf(int d, const char *format, va_list ap);
 #endif