A number of variables are declared in a header with no explicit linkage.
This results in there being definitions of them in multiple object
files, which causes a link failure with GCC 10, since this uses
-fno-common by default.
Add `extern` to the header declarations and separate declarations with
no linkage in xutils.c where they are assigned.
Link: https://bugs.debian.org/957950
Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
I'm forwarding a patch from Michael Bienia <geser@ubuntu.com> that
has been applied to the wmmoonclock package in Ubuntu.
It fixes a build issue that is caused by specifiying libraries before the object
files in the linker command line.
This causes a build failure as Ubuntu's ld defaults to --as-needed, see:
http://wiki.debian.org/ToolChain/DSOLinking#Only_link_with_needed_libraries
[Patch sent by: Felix Geyer <debfx@ubuntu.com>]
