email-footer: add links to the expected common binary packages

We can do other OSs like 32 and 64-bit OS X, but we should encourage
users to use the installer on OS X so we'll omit it here.

tools/email-footer.md

@@ -8,6 +8,14 @@ Windows x64 Installer: http://nodejs.org/dist/__VERSION__/x64/node-__VERSION__-x
 
 Windows x64 Files: http://nodejs.org/dist/__VERSION__/x64/
 
+Linux 32-bit Binary Package: http://nodejs.org/dist/__VERSION__/node-__VERSION__-linux-i686.tar.gz
+
+Linux 64-bit Binary Package: http://nodejs.org/dist/__VERSION__/node-__VERSION__-linux-x86_64.tar.gz
+
+Solaris 32-bit Binary Package: http://nodejs.org/dist/__VERSION__/node-__VERSION__-sunos-i386.tar.gz
+
+Solaris 64-bit Binary Package: http://nodejs.org/dist/__VERSION__/node-__VERSION__-sunos-x86_64.tar.gz
+
 Other release files: http://nodejs.org/dist/__VERSION__/
 
 Website: http://nodejs.org/docs/__VERSION__/