releasetools: don't create prebuilt_dir path if it exits

This path may already exists from previous build tasks. Attempting
to create it again will cause an error.

Change-Id: I4baad8bc846470b99f6ce9207c0682401406decc
Add moar language support

Credits go to CM (squashed commits listed below):

build: Add support for Tamil

Change-Id: Ied26a54e36ef95e11f33600f925931f962798d32

build: Add support for Uyghur

Change-Id: I29fe330daa205f800d4de5c92beae39fca44910d

build: Refactor additional languages/locales

Change-Id: Id90911405f98c5e44d1e5faf071135b8fe59925c

languages_full: Remove duplicate Hindi inclusion

Change-Id: If9138e4b8980cacb37a7029ff42822faab63796e

build: Add support for Asturian

Change-Id: If666c8390b3c095c16e66df777c67a46511f4916

Revert "build: add AST support"

This reverts commit 97e7cae.

Change-Id: Idceb5ecc4655a8dc004a0050afb7c0d23bcc062f

build: add AST support

Change-Id: Id5f88dba528c7b48b1d3f059f9ec65b9e2a88ef5

Enable extra languages (1/2)

- Estonian has AOSP translations
- Malayalam has new translators
- Kurdish has a new translator

PS2:
- Punjabi has a new translator

Change-Id: If60bce3724b18d099c62bad4529b78c204e93768

Enable Uighur Language in build.

Change-Id: I7f9430fa65f6477eb4571c09c5dd6589bd63b2ed
Merge remote-tracking branch 'pa-legacy-kitkat/kitkat' into kitkat