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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<div class='path'>path: <a href='/guix/log/?id=65209ffabd9245fac78eeb2caf5bcca3e4963937'>root</a>/<a href='/guix/log/gnu?id=65209ffabd9245fac78eeb2caf5bcca3e4963937'>gnu</a>/<a href='/guix/log/gnu/services?id=65209ffabd9245fac78eeb2caf5bcca3e4963937'>services</a>/<a href='/guix/log/gnu/services/security-token.scm?id=65209ffabd9245fac78eeb2caf5bcca3e4963937'>security-token.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/gnu/services/security-token.scm?id=65209ffabd9245fac78eeb2caf5bcca3e4963937&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-08-20 21:43:56 -0700'>2018-08-20</span></td><td><a href='/guix/commit/gnu/services/security-token.scm?id=6fb6ac6857df31c55a640eead2a5f79edd7dab14'>gnu: services: Fix pcscd activation bug.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes: &lt;https://bugs.gnu.org/32478&gt;.

* gnu/services/security-token.scm (pcscd-activation): Idempotently create the
/var/lib/pcsc symlink so that it does not fail when it already exists.
</span></span></td><td>Chris Marusich</td></tr>
<tr><td><span title='2018-08-16 02:46:27 +0530'>2018-08-16</span></td><td><a href='/guix/commit/gnu/services/security-token.scm?id=de30205ba0f63eb987097a9f47b6e4fd38cd9044'>gnu: services: Add pcscd service.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/security-token.scm: New file.
* gnu/tests/security-token.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Register new files.
* doc/guix.texi (Miscellaneous Services): Document the service.
</span></span></td><td>Arun Isaac</td></tr>