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
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
Export TARGET_GCC_VERSION as an env variable.

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

Change-Id: I23df88946254a55d0749d6753e54559faf33e121
Define TARGET_GCC_VERSION in target specific make files.

So that GCC refresh can be performed in a target specific way.

Change-Id: I867e8b8fd671bef8c5af300e657a6da4fface032
Enable lunch command to pick up new toolchain version.

Otherwise the previously exported value will be sticky and the value
defined in the TARGET makefile is ignored.

Change-Id: Icdacb8c46034b8a24a9875b7596b31d00861512a
Fixed error message for using OpenJDK.

Output a meaningful error message, when OpenJDK is detected
instead of giving the "wrong java version" output.
That output confused several users (from experiences in IRC)
since it gives you an output like "You are using java
version 1.6.0, right version would be Java SE 1.6".

Change-Id: I31ceeb03f1f98524b2b7de9b8be45231985fdb9e
Signed-off-by: Tim Roes <tim.roes88@googlemail.com>
Specify -msse3 on host as on target.

Make the host and the target x86 build more uniform by using the same machine flags.
Its unlikely Android has ever been built on a machine without SSE3 support.

Bug: 8068608
Change-Id: I19635528b61bf2c6faf02c2e575b1d9bf8025d3a