Been considering to drop USE=glslang on libplacebo in favour of shaderc (the preferred upstream default that wraps around glslang) given glslang breaks things too often, but lacking some keywords to do so. On platforms where glslang is keyworded, there should "in theory" be no issues. Will eventually need stable arm64+ppc as well (not arm32, seems mpv/libplacebo were never stabilized on arm32 for some reason despite it'd kind of make sense for old rpis). Excluding ~hppa, not planning to drop the USE="shaderc vulkan" masks over there. In the event that ppc32 has issues, may give it the same treatment. Thanks.
arm64 done
arm done
ppc done all arches done
