add getresuid and getresgid syscall wrappers

src/misc/getresgid.c

@@ -0,0 +1,8 @@
+#define _GNU_SOURCE
+#include <unistd.h>
+#include "syscall.h"
+
+int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid)
+{
+	return syscall(SYS_getresgid, rgid, egid, sgid);
+}

src/misc/getresuid.c

@@ -0,0 +1,8 @@
+#define _GNU_SOURCE
+#include <unistd.h>
+#include "syscall.h"
+
+int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid)
+{
+	return syscall(SYS_getresuid, ruid, euid, suid);
+}