Cherry pick MIPS build fix

https://chromium-review.googlesource.com/#/c/291080/2

endian_inl.h: fix mips32 android build

when configuring with mips32-android-gcc HAVE_MIPS32 would be set, but the
ndk does not set -mips32r2 for APP_ABI=mips which results in BSwap32 failing
to build; refine the check in endian_inl.h

BUG=522435
TBR=dtrainor@chromium.org

Review URL: https://codereview.chromium.org/1292313007 .
1 file changed