[cmake] update CI deps, feat: sirit CI + new CI spec (#2655)

Updates sirit to our fork's latest version w/ SPIRV Headers included
(end goal is to remove spirv-headers entirely, as spirv-tools-ci should
include them inline as well)

Adds a sirit CI on our fork for all platforms (saves a bit of compile
time)

My CI spec has changed a little bit, and now there is no need for an
additional CMake file after the initial CMakeLists.txt (since targets
are now global imported). Plus, UNIX amd64 now has the amd64 suffix like
aarch64 and windows

Updates SDL2 to 2.32.10 and OpenSSL to 3.6.0

Finally, on Solaris all CI packages (sans FFmpeg) are now built with OmniOS, which
should in theory be fully compatible with OpenIndiana (our recommended
Sun-based target) but obviously will need testing

Need testing:
- [ ] Make sure I didn't nuke shader emission
- [ ] Make sure FreeBSD, OpenBSD, and OpenIndiana work fine with bundled
  sirit (check linking especially)
- [ ] Make sure SDL2, OpenSSL work with OpenIndiana now
- [ ] SDL2 on all platforms (input, etc)

Signed-off-by: crueter <crueter@eden-emu.dev>

Reviewed-on: #2655

docs/CPM.md

@@ -108,7 +108,9 @@ All dependencies must be identifiable in some way for usage in the dependency vi
 URLs:
 
 - `GIT_URL`
-- `REPO` as a GitHub repository
+- `REPO` as a Git repository
+  * You may optionally specify `GIT_HOST` to use a custom host, e.g. `GIT_HOST git.crueter.xyz`. Note that the git host MUST be GitHub-like in its artifact/archive downloads, e.g. Forgejo
+  * If `GIT_HOST` is unspecified, defaults to `github.com`
 - `URL`
 
 Versions (bundled):
@@ -135,11 +137,11 @@ Adds a package that follows crueter's CI repository spec.
   * `windows-amd64`
   * `windows-arm64`
   * `android`
-  * `solaris`
-  * `freebsd`
-  * `linux`
+  * `solaris-amd64`
+  * `freebsd-amd64`
+  * `linux-amd64`
   * `linux-aarch64`
-- `CMAKE_FILENAME`: Custom CMake filename, relative to the package root (default `${PACKAGE_ROOT}/${NAME}.cmake`)
+  * `macos-universal`
 
 ### AddJsonPackage
 
@@ -155,10 +157,17 @@ The cpmfile is an object of objects, with each sub-object being named according
 If `ci` is `false`:
 
 - `hash` -> `HASH`
+- `hash_suffix` -> `HASH_SUFFIX`
 - `sha` -> `SHA`
+- `key` -> `KEY`
 - `tag` -> `TAG`
+  * If the tag contains `%VERSION%`, that part will be replaced by the `git_version`, OR `version` if `git_version` is not specified
+- `url` -> `URL`
 - `artifact` -> `ARTIFACT`
+  * If the artifact contains `%VERSION%`, that part will be replaced by the `git_version`, OR `version` if `git_version` is not specified
+  * If the artifact contains `%TAG%`, that part will be replaced by the `tag` (with its replacement already done)
 - `git_version` -> `GIT_VERSION`
+- `git_host` -> `GIT_HOST`
 - `source_subdir` -> `SOURCE_SUBDIR`
 - `bundled` -> `BUNDLED_PACKAGE`
 - `find_args` -> `FIND_PACKAGE_ARGUMENTS`
@@ -172,7 +181,6 @@ If `ci` is `true`:
 - `name` -> `NAME`, defaults to the object key
 - `extension` -> `EXTENSION`, defaults to `tar.zst`
 - `min_version` -> `MIN_VERSION`
-- `cmake_filename` -> `CMAKE_FILENAME`
 - `extension` -> `EXTENSION`
 
 ### Examples
@@ -192,8 +200,8 @@ In order: OpenSSL CI, Boost (tag + artifact), Opus (options + find_args), discor
     "boost": {
         "package": "Boost",
         "repo": "boostorg/boost",
-        "tag": "boost-1.88.0",
-        "artifact": "boost-1.88.0-cmake.7z",
+        "tag": "boost-%VERSION%",
+        "artifact": "%TAG%-cmake.7z",
         "hash": "e5b049e5b61964480ca816395f63f95621e66cb9bcf616a8b10e441e0e69f129e22443acb11e77bc1e8170f8e4171b9b7719891efc43699782bfcd4b3a365f01",
         "git_version": "1.88.0",
         "version": "1.57"