Records the commands for cross compilation with two methods.
The first method relies on Multiarch. The second approach is to
explicitly
specify the PKG_CONFIG variables, which is widely used in build system
(like Buildroot, Yocto, etc).
There is also:
https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/tree/tools/perf/Documentation/android.txt?h=perf-tools-next
it looks very crufty, not least as it is referring to 32-bit builds
Could this be refreshed or deleted?