Added Compaq CGA emulation. Patch from John Elliott.

src/Makefile.linux32-wx-sdl2

@@ -15,7 +15,7 @@ serial.o sio.o sis496.o sl82c460.o sound.o sound_ad1848.o sound_adlib.o sound_ad
 sound_mpu401_uart.o sound_opl.o sound_pas16.o sound_ps1.o sound_pssj.o sound_sb.o sound_sb_dsp.o sound_sn76489.o \
 sound_speaker.o sound_ssi2001.o sound_wss.o sound_ym7128.o soundopenal.o t1000.o t3100e.o tandy_eeprom.o tandy_rom.o \
 timer.o um8669f.o um8881f.o vid_ati_eeprom.o vid_ati_mach64.o vid_ati18800.o vid_ati28800.o \
-vid_ati68860_ramdac.o vid_cga.o vid_cl5429.o vid_colorplus.o vid_ega.o vid_et4000.o vid_et4000w32.o vid_genius.o vid_hercules.o \
+vid_ati68860_ramdac.o vid_cga.o vid_cl5429.o vid_colorplus.o vid_compaq_cga.o vid_ega.o vid_et4000.o vid_et4000w32.o vid_genius.o vid_hercules.o \
 vid_icd2061.o vid_ics2595.o vid_incolor.o vid_mda.o vid_olivetti_m24.o vid_oti037.c vid_oti067.o vid_paradise.o vid_pc200.o \
 vid_pc1512.o vid_pc1640.o vid_pcjr.o vid_ps1_svga.o vid_s3.o vid_s3_virge.o vid_sdac_ramdac.o \
 vid_stg_ramdac.o vid_svga.o vid_svga_render.o vid_t1000.o vid_t3100e.o vid_tandy.o vid_tandysl.o vid_tgui9440.o \