libplacebo: shaderc vs glslang

I noticed this when debugging a libplacebo build issue.

After meson ran, glslang was disabled but it's listed as Recommended in 
the book and I had it installed. It seems that libplacebo prefers 
shaderc over glslang and will use that if available.

 From src/glsl/meson.build:
if glslang_req.auto() and shaderc.found()

   # we only need one or the other, and shaderc is preferred
   message('Skipping `glslang` because `shaderc` is available')

shaderc isn't mentioned in libplacebo in the book. If shaderc is 
prefered upstream it seems more logical to make that Recommended instead 
of glslang.

Note: I install the full shaderc package, not just the binary.

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