move to build-aux broke CVS m4

[Eric Blake]

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gnulib-tool --import, when parsing modules/gettext, adds
build-aux/config.rpath to the file list.  But for projects that don't yet
have a build-aux directory, such as a fresh checkout of CVS m4, this breaks:

cp: cannot create regular file `./build-aux/config.rpath': No such file or
directory

We need some way to make gnulib-tool respect the spelling of the target
project's AC_CONFIG_AUX_DIR.

- --
Life is short - so eat dessert first!

Eric Blake             address@hidden
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