Bug 886216 - Add missing breakpad patches. r=ted

--HG--
rename : toolkit/crashreporter/breakpad-patches/12-sht-arm-exidx-define.patch => toolkit/crashreporter/breakpad-patches/16-sht-arm-exidx-define.patch
Bug 899405 - Allow host and target compilers to depend on stdc++-compat independently. r=ted
Bug 899405 - Use gcc 4.7 as host compiler for Android builds. r=ted