[wwwdocs] add libstdc++/1773 change to gcc-4.7/changes.html

[Jonathan Wakely]

I've committed this, which documents the fix for
http://gcc.gnu.org/PR1773 in gcc-4.7/changes.html, and also replaces
some > characters with the > entity.

Index: changes.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-4.7/changes.html,v
retrieving revision 1.45
diff -r1.45 changes.html
84c84
<   if (a>10)
---
>   if (a&gt;10)
211c211
< template &lt;class T>
---
> template &lt;class T&gt;
215c215
< template &lt;class T>
---
> template &lt;class T&gt;
218c218
<   void f() { g(T()); } // fix by using this->g or A::g
---
>   void f() { g(T()); } // fix by using this-&gt;g or A::g
225,226c225,226
<   f&lt;int>();
<   A&lt;B>().f();
---
>   f&lt;int&gt;();
>   A&lt;B&gt;().f();
232c232
< template&lt;class W>
---
> template&lt;class W&gt;
242c242
<   int ar[Q&lt;B>::I];
---
>   int ar[Q&lt;B&gt;::I];
268a269,272
> 
>   <li>G++ now sets the predefined macro <tt>__cplusplus</tt> to the
>     correct value, <tt>199711L</tt>.
>   </li>