Import of GNU diff 2.7

Original source available as ftp://prep.ai.mit.edu/pub/gnu/diffutils-2.7.tar.gz

The following files and directories were removed for this import:

Makefile.in
INSTALL
alloca.c
cmp.c
diff.info
diff.info-1
diff.info-2
diff.info-3
diff.info-4
error.c
fnmatch.c
fnmatch.h
memchr.c
mkinstalldirs
regex.c
regex.h
texinfo.tex
waitpid.c