Mention lerp and midpoint in the libstdc++ status.

[Ed Smith-Rowland via libstdc++]

No complete patch because we could just accumulate a few of these.

Ed


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     </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>