MacOS: do not try to have KDE-solid

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit 7ba6f22b3cc769031d3f17a06c31b9740aed0005)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

configure.ac

@@ -4121,7 +4121,7 @@ AC_ARG_WITH(kde-solid,
   AS_HELP_STRING([--with-kde-solid=PATH],
                  [KDE Solid actions directory (auto)]),, [
 
-if test "${SYS}" != "mingw32" -a "${SYS}" != "mingwce" ; then
+if test "${SYS}" != "mingw32" -a "${SYS}" != "mingwce" -a "${SYS}" != "darwin" ; then
   with_kde_solid="yes"
 fi
 ])