Automatically detect and falsh acramfs from the working dir.

_roku_build.sh

@@ -5,6 +5,16 @@ _roku_build_completion()
     :
 }
 
+_roku_repo_root()
+{
+    eval "cd $1; git rev-parse --show-toplevel"
+}
+
+_roku_repo_acramfs_location()
+{
+    echo "$1/port/realtek/stark/$2/dist/image/acramfs/acramfs.bin"
+}
+
 _roku_build()
 {
     __build "$@"