test: tweaks

Fix arc4random exclusion for real.
Silence warning about missing prototype for external helper-function in
tst-scandir

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

test/misc/tst-scandir.c

@@ -3,7 +3,7 @@
 #include <stdio.h> /* perror() */
 #include <stdlib.h>
 
-int skip_all(const struct dirent *dirbuf)
+static int skip_all(const struct dirent *dirbuf)
 {
 	errno = EBADF;
 	return 0;

test/stdlib/Makefile.in

@@ -11,8 +11,9 @@ GLIBC_TESTS_DISABLED :=
 ifeq ($(UCLIBC_HAS_PTY),)
 TESTS_DISABLED += ptytest
 endif
+
 ifeq ($(UCLIBC_HAS_ARC4RANDOM),)
 TESTS_DISABLED += testarc4random
 else
-GLIBC_TESTS_DISABLED += testarc4random
+GLIBC_TESTS_DISABLED += testarc4random_glibc
 endif