MacOS: Respect user set MOCCMD
qt?-darwin.m4 detects value of MOCCMD without considering user set value at all. Make it to support user set value, like general (not-MacOS specific) documentation tells.
qt?-darwin.m4 detects value of MOCCMD without considering user set value at all. Make it to support user set value, like general (not-MacOS specific) documentation tells.