docs: list make as a build dep.

Fixes #45.

R=rsc, r1
CC=golang-dev
https://golang.org/cl/154055

doc/install.html

@@ -154,13 +154,14 @@ $ hg clone -r release https://go.googlecode.com/hg/ $GOROOT
 <h2>Install Go</h2>
 
 <p>The Go tool chain is written in C.  To build it, you need
-to have GCC, the standard C libraries, the parser generator Bison, and the text editor ed
-installed.  On OS X, they can be installed as part of <a href="http://developer.apple.com/TOOLS/Xcode/">Xcode</a>.
-On Linux, 
+to have GCC, the standard C libraries, the parser generator Bison,
+<tt>make</tt> and the text editor <tt>ed</tt> installed.  On OS X, they can be
+installed as part of
+<a href="http://developer.apple.com/TOOLS/Xcode/">Xcode</a>.  On Linux,
 </p>
 
 <pre>
-$ sudo apt-get install bison gcc libc6-dev ed
+$ sudo apt-get install bison gcc libc6-dev ed make
 </pre>
 
 <p>