build: check if pkg-config is installed
build: check if pkg-config is installed

Also, don't check for a specific pkg-config version, since libuv doesn't
use pkg-config itself

unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso