Fix build with newer GCC.

Taken from upstream:

  https://sourceforge.net/p/libwpd/code/ci/333c8a26f231bea26ec3d56245315041bbf5577f/

--- a/src/lib/WPXTable.h
+++ b/src/lib/WPXTable.h
@@ -53,7 +53,7 @@
 	~WPXTable();
 	void insertRow();
 	void insertCell(unsigned char colSpan, unsigned char rowSpan, unsigned char borderBits);
-	const WPXTableCell  *getCell(size_t i, size_t j)
+	const WPXTableCell  *getCell(std::size_t i, std::size_t j)
 	{
 		return &(m_tableRows[i])[j];
 	}
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<tr><td><span title='2022-09-04 23:10:10 +0200'>2022-09-04</span></td><td><a href='/guix/commit/tests/guix-describe.sh?id=9e59dbcd6cc37ee65236edf23a9b32338536e036'>guix describe: Adjust test to latest changes.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to 64a070717c3de32332201df5d6d2d52a7f99dce9.

* tests/guix-describe.sh: Add trailing slash when checking URL.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-09-07 11:40:22 +0200'>2018-09-07</span></td><td><a href='/guix/commit/tests/guix-describe.sh?id=bd7470185bae15e686c2b2a83d3f61807e6fa527'>Add 'guix describe'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/scripts/describe.scm: New file.
* Makefile.am (MODULES): Add it.
(SH_TESTS): Add tests/guix-describe.sh.
* po/guix/POTFILES.in: Add it.
* guix/scripts/pull.scm (display-profile-content): Export.
* guix/describe.scm (current-profile, current-profile-entries): Export.
* tests/guix-describe.sh: New file.
* doc/guix.texi (Features): Mention 'guix pull' and provenance tracking.
(Invoking guix pull): Link to 'guix describe'.
(Channels): Likewise.
(Invoking guix describe): New node.
</span></span></td><td>Ludovic Courtès</td></tr>