[build, cmake] port to solaris (#96)

Co-authored-by: crueter <crueter@eden-emu.dev>
Reviewed-on: #96
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

docs/Solaris.md

@@ -0,0 +1,94 @@
+# Building for Solaris
+
+## Dependencies.  
+Always consult [the OpenIndiana package list](https://pkg.openindiana.org/hipster/en/index.shtml) to cross-verify availability.
+
+Run the usual update + install of essential toolings: `sudo pkg update && sudo pkg install git cmake`.
+
+- **gcc**: `sudo pkg install developer/gcc-14`.
+- **clang**: Version 20 is broken, use `sudo pkg install developer/clang-19`.
+
+Then install the libraies: `sudo pkg install qt6 boost glslang libzip library/lz4 nlohmann-json openssl opus sdl2 zlib compress/zstd unzip pkg-config nasm autoconf mesa library/libdrm header-drm`.
+
+fmtlib is not available on repositories and has to be manually built:
+```sh
+git clone --recurisve --depth=1 https://github.com/fmtlib/fmt.git
+cd fmt
+cmake -DCMAKE_BUILD_TYPE=Release -B build
+cmake --build build
+sudo cmake --install build
+```
+
+pkg lz4 doesn't provide a proper CMakeFile to find the library, has to also be manually built:
+```sh
+git clone --depth=1 https://github.com/lz4/lz4.git
+cd lz4
+gmake
+sudo gmake install
+```
+
+Same goes for zstd:
+```sh
+git clone --depth=1 https://github.com/facebook/zstd.git
+cd zstd
+cmake -DCMAKE_BUILD_TYPE=Release -B build0 -S build/cmake
+cmake --build build0
+cd build0
+sudo gmake install
+```
+
+pkg SDL2 is also not nice to work with on CMake, save yourself some pain and compile it yourself:
+```sh
+git clone --depth=1 --branch=release-2.32.8 https://github.com/libsdl-org/SDL
+cmake -DCMAKE_BUILD_TYPE=Release -B build
+cmake --build build
+sudo cmake --install build
+```
+
+Audio is broken in OpenIndiana [see this issue](https://github.com/libsdl-org/SDL/issues/13405), go into `SDL/CMakeLists.txt` and comment out lines 1468:
+```diff
++#        set(SDL_AUDIO_DRIVER_SUNAUDIO 1)
++#        file(GLOB SUN_AUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/sun/*.c)
++#        list(APPEND SOURCE_FILES ${SUN_AUDIO_SOURCES})
++#        set(HAVE_SDL_AUDIO TRUE)
+```
+For Solaris this issue does not exist - however PulseAudio crashes on Solaris - so use a different backend.
+
+---
+
+### Build preparations:  
+Run the following command to clone eden with git:
+```sh
+git clone --recursive https://git.eden-emu.dev/eden-emu/eden
+```
+You usually want to add the `--recursive` parameter as it also takes care of the external dependencies for you.
+
+Now change into the eden directory and create a build directory there:
+```sh
+cd eden
+mkdir build
+```
+
+Change into that build directory: `cd build`
+
+Now choose one option either 1 or 2, but not both as one option overwrites the other.
+
+### Building
+
+```sh
+# Needed for some dependencies that call cc directly (tz)
+echo '#!/bin/sh' >cc
+echo 'gcc $@' >>cc
+chmod +x cc
+export PATH="$PATH:$PWD"
+```
+
+- **Configure**: `cmake -B build -DYUZU_TESTS=OFF -DYUZU_USE_BUNDLED_SDL2=OFF -DYUZU_USE_EXTERNAL_SDL2=OFF -DYUZU_USE_LLVM_DEMANGLE=OFF -DYUZU_USE_QT_MULTIMEDIA=OFF -DYUZU_USE_QT_WEB_ENGINE=OFF -DYUZU_USE_BUNDLED_VCPKG=OFF -DYUZU_USE_BUNDLED_QT=OFF -DENABLE_QT=OFF -DSDL_AUDIO=OFF -DENABLE_WEB_SERVICE=OFF -DENABLE_QT_UPDATE_CHECKER=OFF`.
+- **Build**: `cmake --build build`.
+- **Installing**: `sudo cmake --install build`.
+
+### Notes
+
+- Modify the generated ffmpeg.make (in build dir) if using multiple threads (base system `make` doesn't use `-j4`, so change for `gmake`).
+- If using OpenIndiana, due to a bug in SDL2 cmake configuration; Audio driver defaults to SunOS `<sys/audioio.h>`, which does not exist on OpenIndiana.
+- Enabling OpenSSL requires compiling OpenSSL manually instead of using the provided one from repositores.