libtoolize: use only space delimited file lists.

libtoolize: use only space delimited file lists.

We don't install any files with whitespace in their file name,
so using colon delimited lists to make that possible was a
premature optimisation and an unneeded complication.
* libtoolize.m4sh (func_copy_some_files): Remove IFS twiddling,
and just pull space delimited files in a for loop idiomatically.
(func_massage_aclocal_DATA, func_install_pkgmacro_subproject)
(func_install_pkgmacro_parent, func_install_pkgmacro_files)
(func_massage_pkgltdl_files, func_massage_pkgconfig_files):
Append to file lists with space delimiter.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>