vendor: build. -j is no longer supported

Change-Id: I3840b696066d1211e77ef3600fe069ff3916cc6e
diff --git a/build/envsetup.sh b/build/envsetup.sh
index b27e71a..707029e 100644
--- a/build/envsetup.sh
+++ b/build/envsetup.sh
@@ -79,7 +79,7 @@
 
 # Make using all available CPUs
 function mka() {
-    m -j "$@"
+    m "$@"
 }
 
 function pushboot() {