Revert "nv50/ir: use unordered_set instead of list to keep track of var uses"

This reverts commit a9b21015f5e3a6a37e53a8b3c755519f7b70479e.
android: loader: prefix static libraries with libmesa_*

Will make it easier on us as CleanSpec.mk comes along and improves
consistency across the Android build.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
android: megadriver_stub: prefix static libraries with libmesa_

Will make it easier on us as CleanSpec.mk comes along and improves
consistency across the Android build.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
android: add CleanSpec.mk

The file contains rules that are executed on incremental builds. This
way one can avoid doing a full clean and ensure that the new object
(library) is correctly build.

Inspired by the work of Chih-Wei Huang, from the Android-x86 project.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>