travis: Use parallel build

Not sure if 4 jobs is optimal, but according to the docs each build host
has 1.5 virtual cores available (although "getconf _NPROCESSORS_ONLN"
returns 32, which is probably the number of real cores underneath), so
more jobs might not actually reduce the build time much more.

diff --git a/scripts/test.sh b/scripts/test.sh
index 80d04d1d53b2c3cde6a0c2b143545b29bc884f9b..4785d060376e60ce0f92a9c1f8a30eace85b5841 100755 (executable)
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -62,4 +62,4 @@ CONFIG="$CONFIG
        --enable-leak-detective=${LEAK_DETECTIVE-no}"
 
 echo "$ ./configure $CONFIG && make $TARGET"
-./configure $CONFIG && make $TARGET
+./configure $CONFIG && make -j4 $TARGET