gnulib-tool.py: Follow gnulib-tool changes, part 37. Follow gnulib-tool change 2018-10-22 Bruno Haible <bruno@clisp.org> Assume Automake >= 1.11. * pygnulib/GLEmiter.py (GLEmiter.lib_Makefile_am) (GLEmiter.tests_Makefile_am): Emit a Makefile.am that requires Automake >= 1.11. * pygnulib/GLTestDir.py (GLTestDir.execute, GLMegaTestDir.execute): Likewise. * pygnulib/constants.py: Update comment.