Revert "build/core: Use better default compiler flags"

This reverts commit 9c83953aea1924516c7bbee9c8a481b4c334c0a8.

Conflicts:
	core/combo/select.mk
Option to use Linaro's compiler flags (see 9c83953)

To enable: export USE_LINARO_COMPILER_FLAGS=yes

Set LD flags to something safe by default.

Original commit: https://github.com/pbeeler/android_build/commit/f54beb181365ac0a1659e9404670789c3d81e578
dumpvar: Print custom build / optimizer options
fix path to sounds in sdk product

This is necessary to build the SDK:

    lunch sdk-eng && make sdk

Change-Id: I7b9dcfc418ddc46e2967b627525d042bbf6334e1