Merge topic 'cmake-m4-destination'

da0e3f90 install: Configurable DESTINATION for the cmake.m4 file

Auxiliary/CMakeLists.txt

@@ -1,4 +1,4 @@
 install(DIRECTORY vim/indent vim/syntax DESTINATION ${CMAKE_DATA_DIR}/editors/vim)
 install(FILES cmake-mode.el DESTINATION ${CMAKE_DATA_DIR}/editors/emacs)
-install(FILES cmake.m4 DESTINATION share/aclocal)
+install(FILES cmake.m4 DESTINATION ${CMAKE_XDGDATA_DIR}/aclocal)
 add_subdirectory (bash-completion)