valacodecontext: Fix uses of g_build_path() to locate GIR XML
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valacodecontext: Really look for GIR XML in Config.GI_GIRDIR
The first argument to Path.build_path is a separator, and for it to be practically useful, at least two subsequent arguments are needed.
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valacodecontext: Look for GIR XML in /usr/share, not ./usr/share
The first argument to g_build_path() is a separator, not the first path element, so to find GIR XML in /usr/share we should make the second argument be an absolute path.
/cc @ricotz