Clang: Silence warnings (3/3)

With GCC >=4.7 Clang generates a lot of noise with various compiler flags,
and can even break the builds when using Flags like Graphite.  This can be
reproduced by doing the following:

Setting TARGET_EXTRA_CFLAGS with Graphite flags such as these
TARGET_EXTRA_CFLAGS +=  -fgraphite-identity \
                        -floop-block \
                        -floop-strip-mine \
                        -ftree-loop-distribution \
                        -ftree-loop-linear

Causes the following errors to occure and the builds to fail:

clang: error: argument unused during compilation: '-fgraphite-identity'
                                                  '-floop-block'
                                                  '-floop-strip-mine'
                                                  '-ftree-loop-distribution'
                                                  '-ftree-loop-linear'

Silence the errors by passing the -Qunused-arguments for CFLAGS

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

More clang fixes

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

Use -Qunused-arguments for LibRs
Signed-off-by: Paul Beeler <sparksco@gmail.com>

Conflicts:
	Android.mk
Add -Wno-unknown-warning-option for libRSDriver

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

Conflicts:
	Android.mk
Use -Wno-unknown-warning-option for libRs

Conflicts:

	Android.mk

Change-Id: I99b31f48805138a268a0fc9a931bfff0944bfea0
use call cc-option

Change-Id: I9f5caff10e737adfd900e6ec264bf03858b91e49
Get rid of -Qunused-arguments

Change-Id: I2b1daf62fa050c434cc1e19ae3851cb6e56f9715