Squash commits of @rascarlo

add support for overriding build.prop settings

comment out the build date assert

Debugging TRUE

Dexpreopt FALSE

Signed-off-by: Paul Beeler <sparksco@gmail.com>
Compiler customizations

option:  Add SaberMod GCC 4.8 androideabi as a BoardConfig
To enable add USE_SABERMOD_ANDROIDEABI_48 := true
to your BoardConfig.mk of a SaberMod supported device

Signed-off-by:  Paul Beeler <sparksco@gmail.com>