Factor out common test functionality to test/common.sh.in.
diff --git a/configure.ac b/configure.ac
index ed9713b..ed7c9ee 100644
--- a/configure.ac
+++ b/configure.ac
@@ -491,6 +491,7 @@
 	doc/html/ru/Makefile \
 	m4/Makefile \
 	man/Makefile \
+	test/common.sh \
 	test/Makefile \
 	test/cuesheets/Makefile \
 	test/flac-to-flac-metadata-test-files/Makefile \