Mention lerp and midpoint in the libstdc++ status.

[Jonathan Wakely]

On 10/05/19 23:12 -0400, Ed Smith-Rowland via libstdc++ wrote:
>No complete patch because we could just accumulate a few of these.

Thanks. I've committed it to trunk and gcc-9-branch, because I'm
probably going to be regenerating the HTML again soon.



>Index: doc/xml/manual/status_cxx2020.xml
>===================================================================
>--- doc/xml/manual/status_cxx2020.xml	(revision 271076)
>+++ doc/xml/manual/status_cxx2020.xml	(working copy)
>@@ -934,6 +934,17 @@
>     </row>
>
>     <row>
>+      <entry>  Well-behaved interpolation for numbers and pointers </entry>
>+      <entry>
>+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0811r3.html">
>+	P0811R3
>+	</link>
>+      </entry>
>+      <entry align="center"> 9.1 </entry>
>+      <entry />
>+    </row>
>+
>+    <row>
>       <?dbhtml bgcolor="#B0B0B0" ?>
>       <entry>  Missing feature test macros </entry>
>       <entry>