Add debug and release modes to the Makefile.
Add debug and release modes to the Makefile.

darcs-hash:20100324184339-f546f-343ecfacb0b0e2e910b6d6a3a7c50ac1338dfd63.gz

nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf