Symlink libshaderc.so.1 for pcsx2

[LoneAngelFayt]

---

• I have read the contributing guideline and understand that I have made the correct modifications

---

Description:

Symlinks libshaderc.so.1 to the copy that ships with duckstation, in the duckstation install block.

Benefits of this PR and context:

pcsx2 dlopens libshaderc.so.1 and there is no copy in the image, so it fails to start:

Failed to load shaderc: Loading libshaderc.so.1 failed: libshaderc.so.1: cannot open shared object file: No such file or directory
Failed to compile utility pipelines
Failed to create GS device
Startup Error: Failed to initialize GS

It only bites on a cold shader cache, which is why it is easy to miss. With a warm /config/.config/PCSX2/cache pcsx2 runs fine without the library.

How Has This Been Tested?

Made the same symlink by hand in a running container off the romm branch, then ran pcsx2 with /config/.config/PCSX2/cache cleared. Without it pcsx2 dies with the error above, with it the game boots. Not yet tested as a rebuilt image.

Source / References:

n/a

[github-actions]

Thanks for opening this pull request! Be sure to follow the pull request template!