The display variable is declared in a header with no explicit linkage.
This results in there being multiple definitions of it in wmbiff.o and
libwmgeneral.a and a failure during linking with gcc 10.
Add `extern` to the header declaration and a separate declaration with no
linkage in wmgeneral.c where it is assigned.
Link: https://bugs.debian.org/957937
Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
There's no need to keep autogenerated files in
repository. Those dockapps which use autotoold must be
autoreconf'ed prior to build, those which use imake must be
xmkmf'ed. As of wmbiff, AC_PATH_XTRA_CORRECTED was a hack to
avoid bug in older autoconf version, which is no longer needed
(it's 2012 now already).
Signed-off-by: Alexey I. Froloff <raorn@raorn.name>
