Use a more modern -j flag.

Change-Id: I2498139dd41637a795ca43f830c952adb2856d83
diff --git a/tools/check_builds.sh b/tools/check_builds.sh
index fd380dd..c255bf0 100644
--- a/tools/check_builds.sh
+++ b/tools/check_builds.sh
@@ -41,7 +41,7 @@
     do
         rm -rf $TEST_BUILD_DIR/$PREFIX-$1
         make PRODUCT-$(echo $1 | sed "s/-.*//" )-installclean
-        make -j6 PRODUCT-$1 dist DIST_DIR=$TEST_BUILD_DIR/$PREFIX-$1
+        make -j16 PRODUCT-$1 dist DIST_DIR=$TEST_BUILD_DIR/$PREFIX-$1
         if [ $? -ne 0 ] ; then
             echo FAILED
             return