[PATCH] tests: don't let config.site affect testsuite

Test 236 "configure directories" failed for me on 64-bit Fedora 20;
it boiled down to the system's config.site causing libdir to
default to /usr/lib64 instead of the autoconf default of /usr/lib.

* tests/base.at (configure directories): Neutralize any preinstalled
config.site from the system.

Signed-off-by: Eric Blake <[email protected]>
---
 tests/base.at | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tests/base.at b/tests/base.at
index 0a9fff6..33a7cfa 100644
--- a/tests/base.at
+++ b/tests/base.at
@@ -682,6 +682,9 @@ AT_CLEANUP

 AT_SETUP([configure directories])

+CONFIG_SITE=/dev/null
+export CONFIG_SITE
+
 AT_DATA([foo.in],
 [[prefix=@prefix@
 exec_prefix=@exec_prefix@
-- 
1.8.4.2