finish tool: untested improvements to the GCC detection logic
finish tool: untested improvements to the GCC detection logic

tulayang/Nim,dom96/Nim,russpowers/Nim,tulayang/Nim,dom96/Nim,dom96/Nim,dom96/Nim,russpowers/Nim,tulayang/Nim,dom96/Nim,russpowers/Nim,dom96/Nim,tulayang/Nim,russpowers/Nim,russpowers/Nim,russpowers/Nim,dom96/Nim,tulayang/Nim,tulayang/Nim,russpowers/Nim