tests: skip dav http-push tests under NO_EXPAT=NoThanks

When built with NO_EXPAT=NoThanks, we will not have a working http-push
over webdav.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Makefile

@@ -2188,6 +2188,7 @@ GIT-BUILD-OPTIONS: FORCE
 	@echo PYTHON_PATH=\''$(subst ','\'',$(PYTHON_PATH_SQ))'\' >>$@
 	@echo TAR=\''$(subst ','\'',$(subst ','\'',$(TAR)))'\' >>$@
 	@echo NO_CURL=\''$(subst ','\'',$(subst ','\'',$(NO_CURL)))'\' >>$@
+	@echo NO_EXPAT=\''$(subst ','\'',$(subst ','\'',$(NO_EXPAT)))'\' >>$@
 	@echo USE_LIBPCRE=\''$(subst ','\'',$(subst ','\'',$(USE_LIBPCRE)))'\' >>$@
 	@echo NO_PERL=\''$(subst ','\'',$(subst ','\'',$(NO_PERL)))'\' >>$@
 	@echo NO_PYTHON=\''$(subst ','\'',$(subst ','\'',$(NO_PYTHON)))'\' >>$@

t/lib-httpd.sh

@@ -36,6 +36,12 @@ then
 	test_done
 fi
 
+if test -n "$NO_EXPAT" && test -n "$LIB_HTTPD_DAV"
+then
+	skip_all='skipping test, git built without expat support'
+	test_done
+fi
+
 test_tristate GIT_TEST_HTTPD
 if test "$GIT_TEST_HTTPD" = false
 then