Add XF86keysym.h detection and use to CMake system, for r34983.

CMakeLists.txt

@@ -338,6 +338,7 @@ if(UNIX AND NOT APPLE)
 	endif()
 
 	find_package(X11 REQUIRED)
+	find_path(X11_XF86keysym_INCLUDE_PATH X11/XF86keysym.h ${X11_INC_SEARCH_PATH})
 
 	# OpenSuse needs lutil, ArchLinux not, for now keep, can avoid by using --as-needed
 	set(LLIBS "-lutil -lc -lm -lpthread -lstdc++ ${X11_X11_LIB} ${X11_Xinput_LIB}")

intern/ghost/CMakeLists.txt

@@ -134,6 +134,11 @@ elseif(UNIX)
 
 	add_definitions(-DPREFIX="${CMAKE_INSTALL_PREFIX}")
 
+	if(X11_XF86keysym_INCLUDE_PATH)
+		add_definitions(-DWITH_XF86KEYSYM)
+		list(APPEND INC ${X11_XF86keysym_INCLUDE_PATH})
+	endif()
+
 elseif(WIN32)
 	if(MSVC)
 		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /WX")