configure: Make "does libgio work" test pull in some actual functions

In commit 76346b6264 we tried to add a configure check that
the libgio pkg-config data was correct, which builds an executable
linked against it.  Unfortunately this doesn't catch the problem
(missing static library dependency info), because a "do nothing" test
source file doesn't have any symbol references that cause the linker
to pull in .o files from libgio.a, and so we don't see the "missing
symbols from libmount" error that a full QEMU link triggers.

(The ineffective test went unnoticed because of a typo that
effectively disabled libgio unconditionally, but after commit
3569a5dfc1 fixed that, a static link of the system emulator on
Ubuntu stopped working again.)

Improve the gio test by having the test source fragment reference a
g_dbus function (which is what is indirectly causing us to end up
wanting functions from libmount).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20201116104617.18333-1-peter.maydell@linaro.org

configure

@@ -3512,8 +3512,15 @@ if $pkg_config --atleast-version=$glib_req_ver gio-2.0; then
     # Check that the libraries actually work -- Ubuntu 18.04 ships
     # with pkg-config --static --libs data for gio-2.0 that is missing
     # -lblkid and will give a link error.
-    write_c_skeleton
-    if compile_prog "" "$gio_libs" ; then
+    cat > $TMPC <<EOF
+#include <gio/gio.h>
+int main(void)
+{
+    g_dbus_proxy_new_sync(0, 0, 0, 0, 0, 0, 0, 0);
+    return 0;
+}
+EOF
+    if compile_prog "$gio_cflags" "$gio_libs" ; then
         gio=yes
     else
         gio=no