doc: solaris info added to go1.5.html

Fixes #11952.

Change-Id: I548f9d75c6223bf79bdf654ef733f1568e3d5804
Reviewed-on: https://go-review.googlesource.com/12990Reviewed-by: Ian Lance Taylor <iant@golang.org>

doc/go1.5.html

@@ -254,6 +254,13 @@ On Darwin, the use of the system X.509 certificate interface can be disabled
 with the <code>ios</code> build tag.
 </p>
 
+<p>
+The Solaris port now has full support for cgo and the packages
+<a href="/pkg/net/"><code>net</code></a> and
+<a href="/pkg/crypto/x509/"><code>crypto/x509</code></a>,
+as well as a number of other fixes and improvements.
+</p>
+
 <h2 id="tools">Tools</h2>
 
 <h3 id="translate">Translating</h3>
@@ -593,6 +600,10 @@ source code directory. Without the expansion the paths would be
 invalid when the current working directory changes.
 </p>
 
+<p>
+Solaris now has full cgo support.
+</p>
+
 <p>
 On Windows, cgo now uses external linking by default.
 </p>