PR-Downloader: Add support for building for ARM on linux and MacOS

[jkells]

This PR improves pr-downloader to build on MacOS on Apple Silicon. It should also now build on ARM linux.
I'm aware there is a lot of work to get the engine running on Mac.

Baby steps.

[p2004a]

Have you tested the output binary and that it is able to download stuff?

[jkells]

I certainly did!

 mkdir -p /tmp/pr-downloader-test && ./src/pr-downloader dev-game:test "Angel Crossing 1.4"  --filesystem-writepath=/tmp/pr-downloader-test
pr-downloader 0.7-762-g577bc33 (macos_arm64)
[Info] /Users/jkells/projects/RecoilEngine/tools/pr-downloader/src/FileSystem/FileSystem.cpp:203:setWritePath():Using filesystem-writepath: /tmp/pr-downloader-test
[Info] /Users/jkells/projects/RecoilEngine/tools/pr-downloader/src/pr-downloader.cpp:191:DownloadSetConfig():Free disk space: 55529 MB
[Info] /Users/jkells/projects/RecoilEngine/tools/pr-downloader/src/Downloader/CurlWrapper.cpp:32:DumpVersion():libcurl 8.7.1 SecureTransport (LibreSSL/3.3.6)
[Info] /Users/jkells/projects/RecoilEngine/tools/pr-downloader/src/Downloader/CurlWrapper.cpp:81:ConfigureCertificates():CURLOPT_CAINFO is nullptr (can be overriden by PRD_SSL_CERT_FILE env variable)
[Info] /Users/jkells/projects/RecoilEngine/tools/pr-downloader/src/Downloader/CurlWrapper.cpp:83:ConfigureCertificates():CURLOPT_CAPATH is nullptr (can be overriden by PRD_SSL_CERT_DIR env variable)
[Info] /Users/jkells/projects/RecoilEngine/tools/pr-downloader/src/Downloader/Http/HttpDownloader.cpp:732:download():Download: num files: 1, protocol: HTTP/1.1, to first byte: 863.292ms, transfer: 863.404ms, num retried errors: 0
[Info] /Users/jkells/projects/RecoilEngine/tools/pr-downloader/src/Downloader/Rapid/RapidDownloader.cpp:254:ParseFD():Found 50 repos in /tmp/pr-downloader-test/rapid/repos.springrts.com/repos.gz
[Info] /Users/jkells/projects/RecoilEngine/tools/pr-downloader/src/Downloader/Http/HttpDownloader.cpp:732:download():Download: num files: 50, protocol: HTTP/1.1, to first byte: [max: 866.031ms 95%: 862.027ms median: 283.210ms mean: 344.250ms], transfer: [max: 1976.567ms 95%: 1703.738ms median: 827.437ms mean: 797.838ms], num retried errors: 0
* Host springfiles.springrts.com:443 was resolved.
* IPv6: (none)
* IPv4: 78.46.21.29
*   Trying 78.46.21.29:443...
* Connected to springfiles.springrts.com (78.46.21.29) port 443
* ALPN: curl offers h2,http/1.1
*  CAfile: /etc/ssl/cert.pem
*  CApath: none
* SSL connection using TLSv1.3 / AEAD-AES256-GCM-SHA384 / [blank] / UNDEF
* ALPN: server accepted http/1.1
* Server certificate:
*  subject: CN=springfiles.springrts.com
*  start date: Apr 19 07:19:38 2025 GMT
*  expire date: Jul 18 07:19:37 2025 GMT
*  subjectAltName: host "springfiles.springrts.com" matched cert's "springfiles.springrts.com"
*  issuer: C=US; O=Let's Encrypt; CN=R10
*  SSL certificate verify ok.
* using HTTP/1.x
> GET /json.php?springname=Angel%20Crossing%201.4 HTTP/1.1
Host: springfiles.springrts.com
User-Agent: pr-downloader/0.7-762-g577bc33
Accept: */*

* Request completely sent off
< HTTP/1.1 200 OK
< Date: Sat, 24 May 2025 08:40:35 GMT
< Server: Apache/2.4.62 (Debian)
< Transfer-Encoding: chunked
< Content-Type: application/json
< 
* Connection #0 to host springfiles.springrts.com left intact
[Info] /Users/jkells/projects/RecoilEngine/tools/pr-downloader/src/Downloader/Rapid/RapidDownloader.cpp:78:download_name():[Download] dev-game test-88-b4fd320
[Info] /Users/jkells/projects/RecoilEngine/tools/pr-downloader/src/Downloader/Http/HttpDownloader.cpp:732:download():Download: num files: 1, protocol: HTTP/1.1, to first byte: 282.060ms, transfer: 282.153ms, num retried errors: 0
[Info] /Users/jkells/projects/RecoilEngine/tools/pr-downloader/src/Downloader/Rapid/Sdp.cpp:381:downloadStream():Using rapid
[Info] /Users/jkells/projects/RecoilEngine/tools/pr-downloader/src/Downloader/Rapid/Sdp.cpp:382:downloadStream():https://repos.springrts.com/dev-game/streamer.cgi?43371108ccfe6c4f4c5a84d897cd3c04
[Info] /Users/jkells/projects/RecoilEngine/tools/pr-downloader/src/main.cpp:185:main():Download complete!

du -hs /tmp/pr-downloader-test

2.6M	/tmp/pr-downloader-test

[jkells]

I've also fixed the formatting which should resolve that github action failure

[p2004a]

Thank you! I will update submodule in engine repo in a moment.