Here is a patch fixing an issue I've noticed in the output of
configure.ac (and configure) created by gnulib.py.

When running the following command,

gnulib-tool.py --create-testdir --dir test-dir-python dummy

creates a configure.ac like so:

gl_source_base='gllib'

\
  m4_ifval(gl_LIBSOURCES_LIST, [
    m4_syscmd([test ! -d ]m4_defn([gl_LIBSOURCES_DIR])[ ||
...
    AC_SUBST([gl_LIBOBJS], [$gl_libobjs])
    AC_SUBST([gl_LTLIBOBJS], [$gl_ltlibobjs])
  ])\n  LIBGNU_LIBDEPS="$gl_libdeps"
...

This causes the 'configure' script to try to execute 'n' twice like
so:

checking for Minix Amsterdam compiler... no
checking for ar... ar
checking for ranlib... ranlib
./configure: line 5004: n: command not found

This seems to be caused by this commit trying to clean up the code:

https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=f00ef30ee0a68bf91cfd081afc784cb8ffd00656

I assume that this string literal was changed to a raw string [1] in
order to avoid having to escape a sed statement. Since it is already
wrapped in triple quotes we can just add a newline in the code and
have the output change instead of using '\n'.

I've also changed the """foo""" quoting to '''foo''' quoting in that
statement. I assume that is also the preferred coding style, feel free
to change it if I misinterpreted. I will have to modify this file a
few times while handling the TODO, so I will fix the other double
quote offenders then.

[1] https://docs.python.org/3/library/re.html#raw-string-notation

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