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

Change-Id: I22893fe61f29111eb902d961b500b2174596268d
1 file changed