[PATCH 6 of 7] test-fuzz-targets: rebuild executable silently

[Yuya Nishihara]

# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1527999792 -32400
#      Sun Jun 03 13:23:12 2018 +0900
# Node ID 3e0005d37e872e95bfc2a9ae092c0db9d412315b
# Parent  125bc211085fadbc9ef6fb717d254c2e007115c1
test-fuzz-targets: rebuild executable silently

This makes sure the build is not broken.

diff --git a/tests/test-fuzz-targets.t b/tests/test-fuzz-targets.t
--- a/tests/test-fuzz-targets.t
+++ b/tests/test-fuzz-targets.t
@@ -1,6 +1,6 @@
 #require clang-libfuzzer test-repo
   $ cd $TESTDIR/../contrib/fuzz
-  $ make
+  $ make -s clean all
 Just run the fuzzers for five seconds each to verify it works at all.
   $ ./bdiff -max_total_time 5
   $ ./xdiff -max_total_time 5