desktop/wmslideshow: Fix for gcc >= 10.x.

Signed-off-by: Matteo Bernardini <ponce@slackbuilds.org>

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

desktop/wmslideshow/wmslideshow.SlackBuild

@@ -80,7 +80,7 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
   -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
-CFLAGS="$SLKCFLAGS" make PREFIX=/usr
+CFLAGS="$SLKCFLAGS -w -Wl,--allow-multiple-definition" make PREFIX=/usr
 make install PREFIX=/usr DESTDIR=$PKG
 
 find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \