[glib] configure: Make GNUC visibility attribute test more reliable.

[Krzesimir Nowak <krnowak src gnome org>]

commit 276cf6ceeea9489ef1ed23788c3c42dee5fcd72d
Author: Krzesimir Nowak <qdlacz gmail com>
Date:   Thu Nov 22 16:56:52 2012 +0100

    configure: Make GNUC visibility attribute test more reliable.
    
    Using "int main (int argc, char** argv)" in this test causes GCC to
    issue two warnings about unused variable if CFLAGS envvar has
    -Wunused-parameter (or just -Wextra). Those warnings are not related
    to the attribute checking but they can make the test fail anyway.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f8ef232..4dc7565 100644
--- a/configure.ac
+++ b/configure.ac
@@ -847,7 +847,7 @@ __attribute__ ((visibility ("default")))
      f_default (void)
 {
 }
-int main (int argc, char **argv)
+int main (void)
 {
 	f_hidden();
 	f_internal();