Include glib.h instead of an internal header.

--- a/goffice-bits/goffice/app/goffice-app.h	2007-01-17 00:17:27.000000000 +0100
+++ b/goffice-bits/goffice/app/goffice-app.h	2014-09-05 19:02:59.402064713 +0200
@@ -22,7 +22,7 @@
 #ifndef GOFFICE_APP_H
 #define GOFFICE_APP_H
 
-#include <glib/gmacros.h>
+#include <glib.h>
 
 G_BEGIN_DECLS
 
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<tr><td><span title='2020-07-25 19:11:37 +0200'>2020-07-25</span></td><td><a href='/guix/commit/gnu.scm?id=d51bfe242fbe6f3f8f71d723e8fe0c7bbe711ba1'>Use 'formatted-message' instead of '&amp;message' where appropriate.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
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