#167 Cinelerra 7 "make clean" doesn't completely work the first time.

[Mat Nieuwenhoven]

After a build, when doing "make clean" make terminated with an error (it runs for a while), and e.g. directory X86_64 in the base directory is not removed. If you run it a second time, the make completes succesfully, and that X86_64 directory is removed.