Makefiles: Build Flags and Toolchain Path
Fix some warnings and compilation errors with gcc 4.8

Signed-off-by: LaboDJ <jacopolabardi@gmail.com>

Conflicts:
	arch/arm/mach-msm/clock-generic.c
GCC 4.9.1: fix compile warnings

Signed-off-by: LaboDJ <jacopolabardi@gmail.com>
Fix for -O2/O3 issue on lib/bitmap.c
GPU: add optimization flags to GPU drivers

Signed-off-by: Lens-F <tnoah12@gmail.com>
Signed-off-by: flar2 <asegaert@gmail.com>

Conflicts:
	drivers/gpu/ion/msm/Makefile
Compressed: optimize for Cortex A15 (thx LaboDJ)

Signed-off-by: LaboDJ <jacopolabardi@gmail.com>