gnulib-tool.py: Follow gnulib-tool changes, part 65.
Follow gnulib-tool change
2021-12-19 Bruno Haible <bruno@clisp.org>
gnulib-tool: Don't insist on ACLOCAL_AMFLAGS.
* pygnulib/GLImport.py (GLImport.execute): Don't add extra '-I' before
m4 directory in ACLOCAL_AMFLAGS. Prefer '0' instead of 'int()'. Mention
the use of AC_CONFIG_MACRO_DIRS in configure.ac as an alternative to
augmenting ACLOCAL_AMFLAGS.
* pygnulib/main.py (main): To find the m4 directories, look also for
AC_CONFIG_MACRO_DIR and AC_CONFIG_MACRO_DIRS invocations in
configure.ac. Remove unnecessary call to 'joinpath' since it accepts a
variable length of arguments.