"make maintainer-clean" cleans up everything that "make distclean" does;

"make maintainer-clean" cleans up everything that "make distclean" does;
there's no need for files in DISTCLEANFILES to be in
MAINTAINERCLEANFILES as well.

In epan, split the generated source files into those that should be
cleaned by "make distclean" and those that shouldn't, and have
DISTCLEANFILES include only the ones that should be cleaned by "make
distclean" and have MAINTAINERCLEANFILES include the ones that shouldn't
be cleaned by "make distclean".  This should fix bug 1595.

The generated source files don't need to be in EXTRA_DIST.

Use LIBWIRESHARK_DISTCLEAN_GENERATED_SRC and
LIBWIRESHARK_NODISTCLEAN_GENERATED_SRC in epan/Makefile.nmake.

svn path=/trunk/; revision=21882