Correct undevbranching of the Matrox Millenium

src/video/CMakeLists.txt

@@ -28,6 +28,10 @@ add_library(vid OBJECT agpgart.c video.c vid_table.c vid_cga.c vid_cga_comp.c
     vid_ibm_rgb528_ramdac.c vid_sdac_ramdac.c vid_ogc.c vid_mga.c vid_nga.c
     vid_tvp3026_ramdac.c vid_att2xc498_ramdac.c vid_xga.c)
 
+if(MGA)
+    target_compile_definitions(vid PRIVATE USE_MGA)
+endif()
+
 if(VGAWONDER)
     target_compile_definitions(vid PRIVATE USE_VGAWONDER)
 endif()

src/video/vid_table.c

@@ -205,7 +205,7 @@ video_cards[] = {
     { &s3_diamond_stealth_4000_pci_device            },
     { &s3_trio3d2x_pci_device                        },
     { &millennium_device                             },
-#if defined(DEV_BRANCH)
+#if defined(DEV_BRANCH) && defined(USE_MGA)
     { &mystique_device                               },
     { &mystique_220_device                           },
 #endif