CMakeLists: Add flag to enable / disable automatic update support

[OatmealDome]

This PR introduces a new CMake option (ENABLE_AUTOUPDATE) and a new define (AUTOUPDATE), which allows one to disable automatic updater support in Windows and macOS builds.

[delroth]

I'm undecided on whether -DSTEAM=ON would be better than -DAUTOUPDATE=OFF or something along those lines. Instead of treating the Steam build specially in that regard, wouldn't it be better to allow disabling features independently of the target?

[OatmealDome]

I was thinking that a STEAM flag would flip all of the settings for Steam automatically (I was specifically considering Billiard's potential Steam Input impl could check for it). But I think having a dedicated AUTOUPDATE flag is good.

[OatmealDome]

Changed the flag to ENABLE_AUTOUPDATE.

[dolphin-emu-bot]

FifoCI detected that this change impacts graphical rendering. Here are the behavior differences detected by the system:

• aeon-charge-attack on ogl-lin-mesa: diff
• bk-tev on ogl-lin-mesa: diff
• burnout2-vehicletextures on ogl-lin-mesa: diff
• chibi-robo-fastdepth on ogl-lin-mesa: diff
• chibi-robo-zfighting on ogl-lin-mesa: diff
• custom-brawl-char on ogl-lin-mesa: diff
• dbz-depth on ogl-lin-mesa: diff
• djhero2-blend on ogl-lin-mesa: diff
• DKCR-Char on ogl-lin-mesa: diff
• DKCR-fast-depth on ogl-lin-mesa: diff
• ea-pink on ogl-lin-mesa: diff
• ed-updated on ogl-lin-mesa: diff
• find-mii on ogl-lin-mesa: diff
• fishing-resort-map on ogl-lin-mesa: diff
• fog-adj on ogl-lin-mesa: diff
• fortune-street on ogl-lin-mesa: diff
• fortune-street-fog on ogl-lin-mesa: diff
• fortune-street-white-box on ogl-lin-mesa: diff
• f-zero-rain on ogl-lin-mesa: diff
• goldeneye-depth on ogl-lin-mesa: diff
• inverted-depth-range on ogl-lin-mesa: diff
• jb-shadow on ogl-lin-mesa: diff
• jd2-fmv on ogl-lin-mesa: diff
• jj-awae-mirrored on ogl-lin-mesa: diff
• kirby-logicop on ogl-lin-mesa: diff
• kirby-shadows on ogl-lin-mesa: diff
• last-story-shadows on ogl-lin-mesa: diff
• lego-star-wars-crane-shadow on ogl-lin-mesa: diff
• lesson08 on ogl-lin-mesa: diff
• lm-mario-portrait on ogl-lin-mesa: diff
• luigi-shadows on ogl-lin-mesa: diff
• mario-baseball-shadows on ogl-lin-mesa: diff
• mario-golf-oob on ogl-lin-mesa: diff
• mario-sluggers-bar on ogl-lin-mesa: diff
• mario-tennis-menu on ogl-lin-mesa: diff
• MaS-LOG-wiimote on ogl-lin-mesa: diff
• megaman-heat on ogl-lin-mesa: diff
• melee-depth on ogl-lin-mesa: diff
• melee-lighting on ogl-lin-mesa: diff
• metroid-visor on ogl-lin-mesa: diff
• mii-channel on ogl-lin-mesa: diff
• milotic-texture on ogl-lin-mesa: diff
• mini-ninjas on ogl-lin-mesa: diff
• mkdd-babypark on ogl-lin-mesa: diff
• mkdd-efb on ogl-lin-mesa: diff
• mkw-bridge on ogl-lin-mesa: diff
• mkwii-bluebox on ogl-lin-mesa: diff
• monkeyball-fuse on ogl-lin-mesa: diff
• mp2-scanner on ogl-lin-mesa: diff
• mp3-bloom on ogl-lin-mesa: diff
• mp4-vertexcache on ogl-lin-mesa: diff
• mp7-text on ogl-lin-mesa: diff
• mtennis-zfreeze on ogl-lin-mesa: diff
• my-word-coach on ogl-lin-mesa: diff
• nddemo-bumpmapping on ogl-lin-mesa: diff
• nddemo-lighting on ogl-lin-mesa: diff
• nfsu-purplerect on ogl-lin-mesa: diff
• nfsu-reflections on ogl-lin-mesa: diff
• nhl-slap on ogl-lin-mesa: diff
• nsmbw-coins on ogl-lin-mesa: diff
• nsmbw-intro on ogl-lin-mesa: diff
• pbr-sfx on ogl-lin-mesa: diff
• pm-hc-jp on ogl-lin-mesa: diff
• rs2-bumpmapping on ogl-lin-mesa: diff
• rs2-glass on ogl-lin-mesa: diff
• rs2-skybox on ogl-lin-mesa: diff
• rs2-zfreeze on ogl-lin-mesa: diff
• rs3-bumpmapping on ogl-lin-mesa: diff
• rs3-skybox2 on ogl-lin-mesa: diff
• sadx-ui on ogl-lin-mesa: diff
• sfa-shadows on ogl-lin-mesa: diff
• sf-assault-flashing on ogl-lin-mesa: diff
• shadow-eyes on ogl-lin-mesa: diff
• simpsons-game on ogl-lin-mesa: diff
• smb-mirror on ogl-lin-mesa: diff
• smg2-fog on ogl-lin-mesa: diff
• smg-marioeyes on ogl-lin-mesa: diff
• smg-mmg on ogl-lin-mesa: diff
• smg-roar on ogl-lin-mesa: diff
• sms-bubbles on ogl-lin-mesa: diff
• sms-gc on ogl-lin-mesa: diff
• sms-water on ogl-lin-mesa: diff
• soa-black on ogl-lin-mesa: diff
• soniccolors-mm on ogl-lin-mesa: diff
• sonic-riders-blur on ogl-lin-mesa: diff
• sonic-riders-zg-4p on ogl-lin-mesa: diff
• sonicriderszg-gb on ogl-lin-mesa: diff
• spyro-bloom on ogl-lin-mesa: diff
• spyro-depth on ogl-lin-mesa: diff
• ssbb-mod-lloyd on ogl-lin-mesa: diff
• ssbm-pointsize on ogl-lin-mesa: diff
• super-sluggers-white-out on ogl-lin-mesa: diff
• sw3-dt on ogl-lin-mesa: diff
• thps3-earlyz on ogl-lin-mesa: diff
• thps4-shadow on ogl-lin-mesa: diff
• tla-menu on ogl-lin-mesa: diff
• tos-invis-char on ogl-lin-mesa: diff
• tp-skin on ogl-lin-mesa: diff
• tsp3-pinkgrass on ogl-lin-mesa: diff
• vegas-party-depth on ogl-lin-mesa: diff
• viewitful-joe-distortion on ogl-lin-mesa: diff
• xenoblade-menu on ogl-lin-mesa: diff
• ztp-grass on ogl-lin-mesa: diff
• zww-armos on ogl-lin-mesa: diff
• zww-water on ogl-lin-mesa: diff
• zww-waves on ogl-lin-mesa: diff

_{^{automated-fifoci-reporter}}