Fix uigetdir, uigetfile, uiputfile. Remove check for nonexistent return value * uigetfile.m: Don't check for existence of fltk script files. They are always distributed, even when built without FLTK. This function failed after moving the helper functions to ./private. * uigetdir.m, uiputfile: same as uigetfile.m * __is_function__.m: Remove comparison with impossible exist return value.

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