nss_wrapper: try to fix the build of nss_wrapper on solaris.

Guenther

lib/nss_wrapper/nss_wrapper.c

@@ -68,6 +68,11 @@
 #define getgrent_r(grdst, buf, buflen, grdstp)		ENOSYS
 #endif
 
+/* not all systems have getgrouplist */
+#ifndef HAVE_GETGROUPLIST
+#define getgrouplist(user, group, groups, ngroups)	0
+#endif
+
 /* LD_PRELOAD doesn't work yet, so REWRITE_CALLS is all we support
  * for now */
 #define REWRITE_CALLS

lib/replace/system/config.m4

@@ -116,6 +116,7 @@ AC_VERIFY_C_PROTOTYPE([struct group *getgrent_r(struct group *src, char *buf, si
 	#include <unistd.h>
 	#include <grp.h>
 	])
+AC_CHECK_FUNCS(getgrouplist)
 
 # locale
 AC_CHECK_HEADERS(ctype.h locale.h)