Restrict relocation packing to Release build.
Pass CONFIGURATION_NAME as an argument to pack_arm_relocations.py, and
turn on packing only if its value is 'Release'. (CONFIGURATION_NAME
cannot be used in conditionals because it is not resolved until after
the conditional has been processed.)
Prior art:
https://code.google.com/p/chromium/codesearch#chromium/src/build/android/gyp/apk_obfuscate.py&l=103
https://code.google.com/p/chromium/codesearch#chromium/src/build/java_apk.gypi&l=742
BUG=385553
Review URL: https://codereview.chromium.org/
396283002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283721 0039d316-1c4b-4281-b951-d872f2087c98