Summary:
This removes some of the libs in the libs folder that were only being used by the OSS Buck build (no longer supported), or the Buck build for samples (which we also no longer project, and ideally would convert to Gradle).
The OSS build doesn't use the remaining bits inside of libs, but D22037411 and D21429174 (ede65bbce4) added logic to co-opt them when building the Java version of Yoga outside of fbandroid. These should probably be moved to instead use `//third-party/java` or `//fbcode/third-party-java` (and something for SoLoader which isn't third party but lives in fbandroid). But that will take more effort to figure out the right steps.
Reviewed By: rshest
Differential Revision: D42248199
fbshipit-source-id: 29a886db14bd5ed9e20f67266be5ea5ac458ce4e
b842a9e1d9