android envsetup: Make passing --target-arch an error.

build/android/envsetup_functions.sh

Index: build/android/envsetup_functions.sh
diff --git a/build/android/envsetup_functions.sh b/build/android/envsetup_functions.sh
index 083cdef22da7c625f0dda16ac653a6e976c06a0c..5d47276f3d06647cf03700e2b8d5fd5398cd8dc8 100755
--- a/build/android/envsetup_functions.sh
+++ b/build/android/envsetup_functions.sh
@@ -43,23 +43,16 @@ common_vars_defines() {
 
 
 ################################################################################
-# Prints out help message on usage.
-################################################################################
-print_usage() {
-  echo "usage: ${0##*/} [--help]" >& 2
-  echo "--help                  this help" >& 2
-}
-
-################################################################################
 # Process command line options.
 ################################################################################
 process_options() {
   while [[ -n $1 ]]; do
     case "$1" in
       --target-arch=*)
-        echo "WARNING: --target-arch is ignored and will be an error soon."
+        echo "ERROR: --target-arch is ignored."
         echo "Pass -Dtarget_arch=foo to gyp instead."
         echo "(x86 is spelled ia32 in gyp, mips becomes mipsel, arm stays arm)"
+        return 1
         ;;
       *)
         # Ignore other command line options