Remove use of interface no longer provided by xorg-server.

Patch taken from upstream:
https://cgit.freedesktop.org/xorg/driver/xf86-video-sis/commit/?id=4b1356a2b7fd06e9a05d134caa4033681c939737

diff --git a/src/sis_driver.c b/src/sis_driver.c
index 8f06164..513f68b 100644
--- a/src/sis_driver.c
+++ b/src/sis_driver.c
@@ -2738,7 +2738,7 @@ SiSPrintModes(ScrnInfoPtr pScrn)
     float hsync, refresh = 0.0;
     char *desc, *desc2, *prefix, *uprefix, *output;
 
-    xf86DrvMsg(pScrn->scrnIndex, pScrn->virtualFrom, "Virtual size is %dx%d "
+    xf86DrvMsg(pScrn->scrnIndex, X_INFO, "Virtual size is %dx%d "
 	       "(pitch %d)\n", pScrn->virtualX, pScrn->virtualY,
 	       pScrn->displayWidth);
 
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<div class='path'>path: <a href='/guix/log/?id=fcc9c5a5753deac83d3e7dfff8a3255cc51e9ca2'>root</a>/<a href='/guix/log/tests?id=fcc9c5a5753deac83d3e7dfff8a3255cc51e9ca2'>tests</a>/<a href='/guix/log/tests/discovery.scm?id=fcc9c5a5753deac83d3e7dfff8a3255cc51e9ca2'>discovery.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/discovery.scm?id=fcc9c5a5753deac83d3e7dfff8a3255cc51e9ca2&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2017-07-03 23:51:23 +0200'>2017-07-03</span></td><td><a href='/guix/commit/tests/discovery.scm?id=960c6ce96d746cf19829ad26e092ec5dad2a5c62'>discovery: Recurse into directories pointed to by a symlink.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-06-18 00:14:07 +0200'>2017-06-18</span></td><td><a href='/guix/commit/tests/discovery.scm?id=d46c4423f46278bd2f96770ceb0667431414349e'>discovery: 'scheme-files' returns '() for a non-accessible directory.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-05-03 23:50:15 +0200'>2017-05-03</span></td><td><a href='/guix/commit/tests/discovery.scm?id=cd903ef7871170d3c4eced45418459d293ef48a7'>Add (guix discovery).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
.scm?id=d422cbb3d6a1cc7e4553a2335b113475a05d68ad'>linux-initrd: 'expression-&gt;initrd' returns the complete file name.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-07 16:06:42 +0100'>2018-11-07</span></td><td><a href='/guix/commit/gnu/build/linux-initrd.scm?id=970c9993f124789cb181f399d4981cdcf5d3fc26'>linux-initrd: Make sure 'build-initrd' can delete files.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>