Fix ndk x86_64 and mips64 builds

x86_64 and mips64 NDK prebuilt libraries are stored in .../usr/lib64,
but arm64 and all the 32-bit ABIs use .../usr/lib.  Add a 64 suffix to
the path for all 64-bit ABIs except arm64.

Change-Id: I98e87ff6a7f1aa75adbeb37c5b1e7208b953322f
1 file changed