mesa: small bugfix update 10.1.2 -> .3

Mainly fixes performance regression for vmware.
llvm+clang: maintenance update 3.4 -> 3.4.1

Slightly hacky for clang at some points, as directory names change strangely.
gtk3: bugfix update 3.12.1 -> .2
lib/maintainers: add "berdario", maintain redis

Relates #2541.