Fix test issue17144-byteswap to respond to APP_ABI in arg

Otherwise test may fail when ABI isn't one of armeabi-v7a, x86, or mips

Change-Id: I130ee64f5dfa80231c8ac3c6ad5b170917d86ee2
Add testcase to check GOT_PREL optimization in gcc4.6+

See build.sh for an example.
The optimization was present in gcc4.6 but not ported to gcc4.8
until https://android-review.googlesource.com/#/c/94660.

Change-Id: If57d962079620d06052e1ccca5a7bb9266e0a5b7
Merge "Fix test issue17144-byteswap to respond to APP_ABI in arg"
Merge "Add testcase to check GOT_PREL optimization in gcc4.6+"
Merge branch 'master' of https://android.googlesource.com/platform/ndk into HEAD