Support installing non-native arch binaries

For the x86_arm target, which uses two 32-bit architectures, x86
libraries should be installed into ".../lib", and arm libraries should
be installed into ".../lib/arm".

This shouldn't be necessary for binaries, but non-native binaries aren't
supported in Make right now, so we can revisit this once it's necessary.

Change-Id: I4d883c85d3ef4945ff6149d9c4fc81af5023e12b
2 files changed