dsp/lossless: workaround gcc-4.9 bug on arm

force Sub3() to not be inlined, otherwise the code in Select() will be
incorrect.
https://android-review.googlesource.com/#/c/102511

Change-Id: I90ae58bf3e6cc92ca9897f69974733d562e29aaf
Merge branch 'cm-11.0' of https://github.com/JustArchi/android_external_webp into cm-11.0