csync cmake: Removed not needed define of DATADIR.

csync/config_csync.h.cmake

@@ -1,7 +1,6 @@
 #cmakedefine PACKAGE "${APPLICATION_NAME}"
 #cmakedefine VERSION "${APPLICATION_VERSION}"
 #cmakedefine LOCALEDIR "${LOCALE_INSTALL_DIR}"
-#cmakedefine DATADIR "${DATADIR}"
 #cmakedefine LIBDIR "${LIBDIR}"
 #cmakedefine PLUGINDIR "${PLUGINDIR}"
 #cmakedefine SYSCONFDIR "${SYSCONFDIR}"