[jfpaardoo]

Description

This PR addresses automatic update notifications and avoids forced 15–20 minute game recompilations when updating Savage Wind (Fixes #606):

1. Automatic update check (runtime/updater.c, runtime/updater.h):

   • Spawns a detached background thread at boot (updater_init()) that queries GitHub Releases (https://api.github.com/repos/Revivedx/SavageWindRecomp/releases?per_page=1).
   • Uses zero external dependencies: dynamically loads wininet.dll (InternetOpenA, InternetOpenUrlA, InternetReadFile) on Windows, and invokes curl on Linux/macOS.
   • Compares the remote tag_name with SAVAGEWIND_VERSION (handling semantic versioning v prefixes and prerelease versions).
   • If a newer release is found, displays an update notification button on the start screen (Update available: <version>) right above the version watermark, which opens the release page directly via SDL_OpenURL().

2. Game code reuse without forced recompilation (runtime/gamelib.c, runtime/gamelib.h, runtime/ui/launcher.mm):

   • take_sites() in runtime/gamelib.c was already designed to accept older game builds as long as all required symbols are present and clear optional ones. However, a strict t->id == gamelib_id() equality previously blocked loading and forced full re-extraction/recompilation even when the ABI was identical.
   • Adds gamelib_abi_compatible() and gamelib_exact_id(). When an existing swgame library matches GAMELIB_ABI and passes take_sites(), the game can be played immediately without forcing the player to recompile.
   • Can be opted out at any time with SAVAGEWIND_REUSE_GAMELIB=0.
   • The launcher status line marks this clearly (Game files ready (previous game build).) with a hint that players can rebuild anytime under Game Files if they wish to apply the latest patches.
   • All 13 language translation tables (runtime/ui/i18n/*.inc) updated and verified with tools/i18n_check.py.

Validation

• make runtime-objs -j8 compiled cleanly.
• make test-pc-controls passed.
• make test-actions passed.
• python tools/i18n_check.py passed with 0 missing, 0 unused across all 13 languages.
• git diff --check passed cleanly.

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