Fix android_gdbserver script to work with changes from a137675.

Also stop assuming ANDROID_ARCH one of x86 or arm.

NOTRY=true
R=mtklein@google.com, djsollen@google.com

Author: halcanary@google.com

Review URL: https://codereview.chromium.org/256413006

git-svn-id: http://skia.googlecode.com/svn/trunk@14358 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed