jenkins.sh: Disable sanitize for FreeBSD

Our current build server uses clang-3.4.1 and FreeBSD10.3, and
AddressSanitizer support is not good yet on those versions, triggering
some link issues when it is enabled.

I tested using newer clang 3.7.1 in the same FreeBSD version but another
compiler error related to __builtin_cpu_supports is triggered.

Conclusion: Explicitly disable AddressSanitizer until we move to
FreeBSD11 with clang 3.8. Before this commit, AddressSanitizer was
implicitly disabled due to a shell compatibility issue which is fixed
in next commit in the series, thus we need to explicitly disable it here.

Change-Id: I0db497045a2ebf7877232b28ae1fcf1fd89fb3f3
diff --git a/contrib/jenkins.sh b/contrib/jenkins.sh
index 0c11682..bb6c3cb 100755
--- a/contrib/jenkins.sh
+++ b/contrib/jenkins.sh
@@ -4,8 +4,14 @@
 
 ./contrib/verify_value_string_arrays_are_terminated.py $(find . -name "*.[hc]")
 
+if [ "x$label" = "xFreeBSD_amd64" ]; then
+        ENABLE_SANITIZE=""
+else
+        ENABLE_SANITIZE="--enable-sanitize"
+fi
+
 autoreconf --install --force
-./configure --enable-static --enable-sanitize
+./configure --enable-static $ENABLE_SANITIZE
 $MAKE $PARALLEL_MAKE check \
   || cat-testlogs.sh
 $MAKE distcheck \