Build/package stlport and libc++ for unknown archs.

Change-Id: I0fdd757c0c585abaa256e59e2bc14212bd06a000

Conflicts:
	build/tools/build-target-prebuilts.sh
	build/tools/package-release.sh
Remove sincos patch, add test

The patch is pushed out to toolchain/gcc.git with a new
-fsincos option.  See https://android-review.googlesource.com/#/c/49396

Change-Id: I8c054626e1afbd2c50f167bcc33b27cca63c26eb
Prevent building broken tests with GCC 4.6

Only a work-around for the underlying issues. See
https://b.android.com/45725

Change-Id: I79d15e8114288f149c27458390bd60f9d42e22f0

Conflicts:
	tests/build/flto/BROKEN_BUILD
Determine library suffix by ABI.

Change-Id: I2ae5b6dcc949f0c47392b2afbe49984250ba9478

Conflicts:
	build/tools/builder-funcs.sh
Determine library suffix by ABI.

Change-Id: I2ae5b6dcc949f0c47392b2afbe49984250ba9478