check-def.sh: Adjust test to exempt _cairo_test_* functions as well as _cairo_*_test_*

This test started failing with the recent renaming of the following
three functions, (before they had no cairo in their names so they
were not getting picked up at all):

_cairo_test_fallback_surface_create
_cairo_test_meta_surface_create
_cairo_test_paginated_surface_create_for_data

With this change, the failure now goes away again.

src/check-def.sh

@@ -27,7 +27,7 @@ for def in $defs; do
 
 	{
 		echo EXPORTS
-		eval $get_cairo_syms | grep -v '^_cairo_.*_test_\|^_fini\|^_init' | sort -u
+		eval $get_cairo_syms | grep -v '^_cairo_.*test_\|^_fini\|^_init' | sort -u
 		# cheat: copy the last line from the def file!
 		tail -n1 $def
 	} | diff $def - || status=1