Add cmake check whether sys/sysmacros.h exists

Unfortunately 9ada8baca6 failed to compile
on FreeBSD due to the header not existing. So we need to check the
existance and properly guard with ifdef.

CMakeLists.txt

@@ -337,6 +337,7 @@ check_include_file("linux/fb.h"    HAVE_LINUX_FB_H)
 add_feature_info("linux/fb.h"
                  HAVE_LINUX_FB_H
                  "Required for the fbdev backend")
+check_include_file("sys/sysmacros.h" HAVE_SYS_SYSMACROS_H)
 
 ########### global ###############
 set(kwin_effects_dbus_xml ${CMAKE_CURRENT_SOURCE_DIR}/org.kde.kwin.Effects.xml)

config-kwin.h.cmake

@@ -21,6 +21,7 @@
 #cmakedefine01 HAVE_PR_SET_PDEATHSIG
 #cmakedefine01 HAVE_SYS_PROCCTL_H
 #cmakedefine01 HAVE_PROC_TRACE_CTL
+#cmakedefine01 HAVE_SYS_SYSMACROS_H
 #cmakedefine01 HAVE_BREEZE_DECO
 #cmakedefine01 HAVE_UDEV
 #if HAVE_BREEZE_DECO

logind.cpp

@@ -29,7 +29,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <QDBusMetaType>
 
 #include <sys/stat.h>
+#include <config-kwin.h>
+#if HAVE_SYS_SYSMACROS_H
 #include <sys/sysmacros.h>
+#endif
 #ifndef major
 #include <sys/types.h>
 #endif