tests: avoid possible autotools caching issues (automake bug#13832)

* t/ar-lib4.sh: Here, by removing the autom4te cache before editing
configure.ac and re-running the autotools.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

diff --git a/t/ar-lib4.sh b/t/ar-lib4.sh
index 68615e8..4d3c40a 100755 (executable)
--- a/t/ar-lib4.sh
+++ b/t/ar-lib4.sh
@@ -39,6 +39,8 @@ AUTOMAKE_fails
 
 grep 'requires.*AM_PROG_AR' stderr
 
+rm -rf autom4te*.cache
+
 cp X configure.ac
 
 cat >> configure.ac << 'END'