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

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

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

desktop/wmsysmon/wmsysmon.SlackBuild

@@ -85,7 +85,7 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 \
   -o -perm 400 \) -exec chmod 644 {} \;
 
-CFLAGS="$SLKCFLAGS"
+export CFLAGS="$SLKCFLAGS -fcommon"
 cd src
 mkdir -p $PKG/usr/bin
 make