omatrack: fetch the pinned source from a copy, upstream is gone (#865)

tobi/omatrack no longer exists on GitHub, so the pinned commit's archive is
404 and 1.8.6 cannot be rebuilt; the old repository host's sync deleted the
published 1.8.6-1 from R2, leaving edge at 1.2.0. A public copy serves the
same commit with an archive matching the pinned sha256 byte for byte.

pkgrel 2 gives the rebuild a new filename, so no cache can serve the
deleted 1.8.6-1 bytes for it.

pkgbuilds/omatrack/PKGBUILD

@@ -2,7 +2,7 @@
 
 pkgname=omatrack
 pkgver=1.8.6
-pkgrel=1
+pkgrel=2
 pkgdesc="Cross-format motorsport telemetry analysis workstation"
 arch=('x86_64' 'aarch64')
 url="https://github.com/tobi/omatrack"
@@ -12,8 +12,11 @@ makedepends=('cmake' 'ninja' 'rust')
 options=('!debug' '!lto')
 
 _commit=cd3fcdda3f8e15fda73288f6cf3803164138a7e4
+# tobi/omatrack is gone from GitHub. This copy serves the same commit; its
+# archive matches the sha256 below byte for byte. Do not follow it for updates.
+_source_copy=https://github.com/y4b9vb7nk9-debug/omatrack
 source=(
-  "omatrack-$_commit.tar.gz::$url/archive/$_commit.tar.gz"
+  "omatrack-$_commit.tar.gz::$_source_copy/archive/$_commit.tar.gz"
   'lua-5.4.7.tar.gz::https://www.lua.org/ftp/lua-5.4.7.tar.gz'
   'sol2-d805d027.tar.gz::https://github.com/ThePhD/sol2/archive/d805d027e0a0a7222e936926139f06e23828ce9f.tar.gz'
 )