Use google gcc 4.7

Change-Id: Ic581b505f267d6fa3011bc5831aeedabf2255d85
Add TARGET_GCC_VERSION

Default to 4.6, but can overwritten to something else in
prebuilts/gcc/$os/$arch/$arch-linux-android*-$ver

Change-Id: I16f99d642b8ff8e831d392261a0c536041107051
[ARM] Extend the usage of TARGET_GCC_VERSION for gdb and arm-eabi-*.

In the future to upgrade the gcc version we just need to edit one
line in core/config.mk.

Change-Id: I01bb38c38f2388913bb7369aa4b2da480411dfbe

Conflicts:
	envsetup.sh
Use GCC 4.7 from google

Noticible preformance improvement
Fixes needed
*Framework/rs
*System/security
*external/oprofile
*external/elfutils
*external/v8

Change-Id: Ic1eadf1fa7df1525471b9c844ac0c4bd9e778330
Export TARGET_GCC_VERSION as an env variable.

Have it referenced by the adbs tool to pick the specified toolchain.

Change-Id: I23df88946254a55d0749d6753e54559faf33e121
Enable 03
Allow configuration of gcc version used for build

You can override the default version by setting the value of
TARGET_GCC_VERSION in the BoardConfig.mk file. For example,
to select version 4.6, add the following:

TARGET_GCC_VERSION := 4.6

Change-Id: I10afb47b18c45e2b913b8af8f34cb98e5e96cbf2
add optimizations to lunch
Make gcc 4.6 default and non O3

* to use gcc 4.7 add TARGET_GCC_VERSION := 4.7 to your board config
* to use O3 add TARGET_USE_O3

Change-Id: Ia4a00023c84cc21122bdf1c116e51a179ccabd8c
add customizations to lunch