Fixed XF86 VidMode extension dynamic loading with CMake project.

cmake/sdlchecks.cmake

@@ -491,11 +491,11 @@ macro(CheckX11)
       endif(VIDEO_X11_XSHAPE AND HAVE_XSHAPE_H)
 
       if(VIDEO_X11_XVM AND HAVE_XF86VM_H)
-        if(HAVE_X11_SHARED AND XF86VMODE_LIB)
-          set(SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE "\"${XF86VMODE_LIB_SONAME}\"")
-        else(HAVE_X11_SHARED AND XF86VMODE_LIB)
-          list(APPEND EXTRA_LIBS ${XF86VMODE_LIB})
-        endif(HAVE_X11_SHARED AND XF86VMODE_LIB)
+        if(HAVE_X11_SHARED AND XXF86VM_LIB)
+          set(SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE "\"${XXF86VM_LIB_SONAME}\"")
+        else(HAVE_X11_SHARED AND XXF86VM_LIB)
+          list(APPEND EXTRA_LIBS ${XXF86VM_LIB})
+        endif(HAVE_X11_SHARED AND XXF86VM_LIB)
         set(SDL_VIDEO_DRIVER_X11_XVIDMODE 1)
         set(HAVE_VIDEO_X11_XVM TRUE)
       endif(VIDEO_X11_XVM AND HAVE_XF86VM_H)