This patch fixes a few bugs introduced in 601.4.41's new features:
- a variable name would not be recognized if it has an underscore and is a string variable with a subscript, i.e. obtaining individual bytes from a string,
- the error message for an unknown variable would come from gcc and not Golf. It should come from Golf as it more to the point and color coded, i.e. easier to see immediately what the issue is,
- better error handling for variable types when wrong type is used,
- building Golf programs is faster because executables are not stripped anymore. Stripping didn't add anything in terms of performance, and the amount of debugging information is minimal (as far as the size on disk); plus the debugging info is not read in memory at run time so the run-time cost is zero.