Embedded server option in mysql formula.

New option in mysql formula which commands to build embedded server
static library (libmysqld.a) needed by various software (e.g. Amarok).

Closes Homebrew/homebrew#4008.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Formula/mysql.rb

@@ -11,6 +11,7 @@ class Mysql <Formula
     [
       ['--with-tests', "Keep tests when installing."],
       ['--with-bench', "Keep benchmark app when installing."],
+      ['--with-embedded', "Build the embedded server."],
       ['--client-only', "Only install client tools, not the server."],
       ['--universal', "Make mysql a universal binary"]
     ]
@@ -49,6 +50,7 @@ class Mysql <Formula
       "--with-partition"]
 
     configure_args << "--without-server" if ARGV.include? '--client-only'
+    configure_args << "--with-embedded-server" if ARGV.include? '--with-embedded'
 
     system "./configure", *configure_args
     system "make install"