Skip the top out directory in mgrep.

Change-Id: I0530b24179034f521dc2366588cdc906ef466750
diff --git a/envsetup.sh b/envsetup.sh
index 2da629d..701c0f6 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -835,7 +835,7 @@
     Darwin)
         function mgrep()
         {
-            find -E . -name .repo -prune -o -name .git -prune -o  -type f -iregex '.*/(Makefile|Makefile\..*|.*\.make|.*\.mak|.*\.mk)' -print0 | xargs -0 grep --color -n "$@"
+            find -E . -name .repo -prune -o -name .git -prune -o -path ./out -prune -o -type f -iregex '.*/(Makefile|Makefile\..*|.*\.make|.*\.mak|.*\.mk)' -print0 | xargs -0 grep --color -n "$@"
         }
 
         function treegrep()
@@ -847,7 +847,7 @@
     *)
         function mgrep()
         {
-            find . -name .repo -prune -o -name .git -prune -o -regextype posix-egrep -iregex '(.*\/Makefile|.*\/Makefile\..*|.*\.make|.*\.mak|.*\.mk)' -type f -print0 | xargs -0 grep --color -n "$@"
+            find . -name .repo -prune -o -name .git -prune -o -path ./out -prune -o -regextype posix-egrep -iregex '(.*\/Makefile|.*\/Makefile\..*|.*\.make|.*\.mak|.*\.mk)' -type f -print0 | xargs -0 grep --color -n "$@"
         }
 
         function treegrep()