gnulib-tool.py: Don't perform newline conversions. * pygnulib/constants.py (nlconvert): Remove function. Remove unused platform import. * pygnulib/GLImport.py (GLImport.gnulib_cache): Remove calls to nlconvert(). * pygnulib/GLModuleSystem.py (GLModule.getAutomakeSnippet_Unconditional): Likewise. * pygnulib/GLTestDir.py (GLTestDir.execute, GLMegaTestDir.execute): Likewise.