Check availavility of -fstack-protector-all

Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

configure

diff --git a/configure b/configure
index 4d81f55..1f6de41 100755
--- a/configure
+++ b/configure
@@ -102,7 +102,7 @@
 QEMU_CFLAGS="-I. -I\$(SRC_PATH) $QEMU_CFLAGS"
 LDFLAGS="-g $LDFLAGS"
 
-gcc_flags="-Wold-style-declaration -Wold-style-definition"
+gcc_flags="-Wold-style-declaration -Wold-style-definition -fstack-protector-all"
 cat > $TMPC << EOF
 int main(void) { }
 EOF