Bug 1046929. Remove ACDEFINES += -UWIN32_LEAN_AND_MEAN from gfx/thebes/Makefile.in

This is very old and doesn't seem to be needed anymore.

--HG--
extra : rebase_source : 557fe01c658f7644fe8ecd35e96a5e8e285be718
Bug 1043689 - Cancel state in the GEL when processing a cancelled touch block. r=botond