move mesa10 build into .old scheme:
- add ${X11SRCDIR.MesaLib.old} and introduce ${X11SRCDIR.Mesa} as an alias for either the former or the non old. this allows many of the makefiles to simply
move mesa10 build into .old scheme:
- add ${X11SRCDIR.MesaLib.old} and introduce ${X11SRCDIR.Mesa} as an alias for either the former or the non old. this allows many of the makefiles to simply use ${X11SRCDIR.Mesa} (but does not really enable much sharing of makefiles, but reduces their diffs.)
- use mesa-which.mk to define ${OLD_PREFIX} to either "" or ".old", and to know if to build 'dri7' (.old only.) ${OLD_PREFIX} is used by other code (eg, LIBDPLIBS) to pick the right subdir.
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