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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<div class='path'>path: <a href='/guix/log/?id=eb9f726d22751dd77984b106f2dbf1c0d336954b'>root</a>/<a href='/guix/log/tests?id=eb9f726d22751dd77984b106f2dbf1c0d336954b'>tests</a>/<a href='/guix/log/tests/records.scm?id=eb9f726d22751dd77984b106f2dbf1c0d336954b'>records.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/records.scm?id=eb9f726d22751dd77984b106f2dbf1c0d336954b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-01-16 18:30:57 +0100'>2020-01-16</span></td><td><a href='/guix/commit/tests/records.scm?id=47212fc763788660ff9051ccee1f6fa8a0db7bdd'>records: Improve reporting of "invalid field specifier" errors.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-30 11:08:39 +0100'>2019-03-30</span></td><td><a href='/guix/commit/tests/records.scm?id=d2be7e3c4ba8d6d0dde9b4c0bff623ab85637424'>records: Support custom 'this' identifiers.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-25 23:37:06 +0100'>2019-03-25</span></td><td><a href='/guix/commit/tests/records.scm?id=abd4d6b33dba4de228e90ad15a8efb456fcf7b6e'>records: Allow thunked fields to refer to 'this-record'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-22 23:04:05 +0100'>2019-01-22</span></td><td><a href='/guix/commit/tests/records.scm?id=c2dcff41c2e47f5f978f467864d5ed7829939884'>records: Detect duplicate field initializers.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-08-31 17:26:56 +0200'>2018-08-31</span></td><td><a href='/guix/commit/tests/records.scm?id=8e1395be5c7d1a6e895fb5b1e70bebc0fef161a6'>records: Adjust to test changes in 'record-abi-mismatch-error'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-05-23 10:21:02 +0200'>2018-05-23</span></td><td><a href='/guix/commit/tests/records.scm?id=7874bbbb9f09cc14ea3e179fd0fa10da5f90cfc7'>records: Insert record type ABI checks in constructors.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>