* Build-Depends on pkg-config
* Apply patch accepted upstream to work around a false-positive in the
  X11 mouse wheel code (Closes: #723797).  Thanks Darren Salt for the
  report and the fix.
* Review and removal of old patches not applied in SDL2, virtually of
  them applied upstream, or rejected as invalid for good reason, or
  don't apply any more (code/functionality removed upstream).  I
  forwarded and documented the remaining patches.
  - 001_autogen_autotools_fix.diff
  - 020_libcaca_new_api.diff
  - 030_pulseaudio_enable.diff
  - 040_propagate_pic_to_nasm.diff
  - 050_altivec_detection.diff
  - 060_disable_ipod.diff
  - 205_lock_keys.diff
  - 205_x11_keysym_fix.diff
  - 206_gcc4_compilation_fix.diff
  - 209_alsa_priority.diff
  - 214_missing_mmx_blit.diff
  - 215_kfreebsd_gnu.diff
  - 216_page_size.diff
  - 217_x11_keytounicode.diff
  - 218_double_free.diff
  - 218_joystick_memmove.diff
  - 219_pulseaudio_crackles.diff
  - 220_std_cld.diff
  - 221_check_SDL_NOKBD_environment_variable.diff
  - 222_joystick_crash.diff
  - 310_fixmouseclicks
  - 310_segfault_noGLX.diff
  - 320_activate_xrandr_on_default.diff
  - 320_disappearingcursor.diff