When building lists of things in Makefiles it's convenient to have a
list terminator to avoid hanging backslash problems. eg:
EXTRA_DIST = \
thing1 \
thing2 \
$(NULL)
Cherry picked from virt-v2v commit 09b86c07bf19beba9ccb8fcca0ebfae34dd56406
Cherry picked from guestfs-tools commit dad8c0d3803dcbc91e22ca35c630d9e8a01df81b
By adding common CLEANFILES and DISTCLEANFILES variables to
common-rules.mk, we can remove these from most other Makefiles, and
also clean files more consistently.
Note that bin_PROGRAMS are already cleaned by 'make clean', so I
removed cases where these were unnecessarily added to CLEANFILES.
We don't support RHEL 5 upstream (see the 'oldlinux' branch for a
version that works with RHEL 5). Therefore remove a bunch of hacks
that were only needed on RHEL 5.
This file is mainly a central place to:
- include localenv if it exists, and
- define the RHEL 5 backwards compatibility macros, instead of
spreading them over every other file.
