Remove non-UTF-8 character (this is a NO-BREAK SPACE character, encoded in
ISO-8859-1) to fix build failure with 'glib-mkenums' in GLib 2.54.2+.

Patch from <https://github.com/macports/macports-ports/commit/1f3efc8e65cc060d1701407bd1e56e62e6bd9c55>.

--- a/libgnome/gnome-config.h	2009-04-23 04:29:13.000000000 -0500
+++ b/libgnome/gnome-config.h	2017-10-04 02:17:22.000000000 -0500
@@ -270,7 +270,7 @@ void gnome_config_clean_key_ (const char
 #define gnome_config_private_clean_key(path) \
 	(gnome_config_clean_key_((path),TRUE))
 
-/* returns the true filename of the config file */
+/* returns the true filename of the config file */
 #define gnome_config_get_real_path(path) \
 	(g_build_filename (gnome_user_dir_get(),(path),NULL))
 #define gnome_config_private_get_real_path(path) \
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<tr><td><span title='2015-06-29 23:08:36 +0200'>2015-06-29</span></td><td><a href='/guix/commit/doc/environment-gdb.scm?id=fe36d84eae08c485f4991f0e2ee0e53d55833f26'>doc: Add 'guix environment' examples.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/environment-gdb.scm: New file.
* doc.am (EXTRA_DIST): Add it.
* doc/guix.texi (Invoking guix environment): Clarify wording of the first
  example.  Add a --ad-hoc example upfront.  Add an example for '-e', and one
  for '-l'.
</span></span></td><td>Ludovic Courtès</td></tr>