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='2020-08-20 15:28:13 -0500'>2020-08-20</span></td><td><a href='/guix/commit/gnu/packages/patches/libmhash-hmac-fix-uaf.patch?id=1cc75fef122db08dd30a86a8074e7ac10fbc00c0'>gnu: libmhash: Fix use-after-free in tests.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/libmhash-hmac-fix-uaf.patch: New patch.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/mcrypt.scm (libmhash)[source]: Use it.
</span></span></td><td>Eric Bavier</td></tr>