Makefile overhaul. All generated bitmaps are now explicitly in OBJDIR/bitmaps and OBJDIR/pluginbitmaps, and plugins properly depend on their respective bitmap files. Fixes #6847.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18987 a1c6a512-1295-4272-9138-f99709370657
19 files changed