[wwwdocs] Remove gcc.skazkaforyou.com mirror

[Gerald Pfeifer]

This mirror has gone rogue and the domain is for sale, so I went
ahead and removed it with the patch below.

Gerald

Index: mirrors.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/mirrors.html,v
retrieving revision 1.251
diff -u -r1.251 mirrors.html
--- mirrors.html	2 Jun 2018 21:16:10 -0000	1.251
+++ mirrors.html	1 Sep 2018 12:09:33 -0000
@@ -19,7 +19,6 @@
 <li>Austria: <a href="ftp://gd.tuwien.ac.at/gnu/gcc/">gd.tuwien.ac.at</a>, thanks to Antonin.Sprinzl at tuwien.ac.at</li>
 -->
 <li>Canada: <a href="http://gcc.parentingamerica.com">http://gcc.parentingamerica.com</a>, thanks to James Miller (jmiller at parentingamerica.com).</li>
-<li>Canada: <a href="http://gcc.skazkaforyou.com">http://gcc.skazkaforyou.com</a>, thanks to Sergey Ivanov (mirrors at skazkaforyou.com)</li>
 <li>France (no snapshots): <a href="ftp://ftp.lip6.fr/pub/gcc/">ftp.lip6.fr</a>, thanks to ftpmaint at lip6.fr</li>
 <li>France, Brittany: <a href="ftp://ftp.irisa.fr/pub/mirrors/gcc.gnu.org/gcc/">ftp.irisa.fr</a>, thanks to ftpmaint at irisa.fr</li>
 <li>France, Versailles: <a href="ftp://ftp.uvsq.fr/pub/gcc/">ftp.uvsq.fr</a>, thanks to ftpmaint at uvsq.fr</li>