[vala: 2/2] build: Add "test-update" which passed UPDATE_EXPECTED=1 to refresh c-expected

[Rico Tzschichholz <ricotz src gnome org>]

commit 6783dbaf63c200bc60198f98be08d2ecf0ff3a57
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Fri Nov 26 15:57:47 2021 +0100

    build: Add "test-update" which passed UPDATE_EXPECTED=1 to refresh c-expected

 Makefile.am | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/Makefile.am b/Makefile.am
index 47032fdd7..19aaa219c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -56,6 +56,10 @@ test-asan:
 test-ubsan:
        cd tests && $(MAKE) $(AM_MAKEFLAGS) check TEST_CFLAGS="$(TEST_CFLAGS) -g3 -fsanitize=undefined"
 
+.PHONY: test-update
+test-update:
+       cd tests && $(MAKE) $(AM_MAKEFLAGS) check UPDATE_EXPECTED=1
+
 #if ENABLE_COVERAGE
 .PHONY: coverage coverage-report
 coverage: