[racket] Make Install Flag for Copying libmzgc

There's not a `configure` flag currently, though there should be one.
Instead, after `configure`, use `make both` and `make install both`
to get CGC binaries and libraries.

At Thu, 6 Mar 2014 13:14:38 -1000, Cody Eilar wrote:
> What is the flag needed when buidling for Unix/Linuxto include the libmzgc
> stuff? I'm currently using
> 
> ./configure --enable-shared --enable-libs --enable-xonx
> 
> What I have been doing is manually copying over the .so files after running
> make & make install  from /build/racket/.libs to my ${prefix}/lib
> directory. What am I missing? Why won't the install script just do this for
> me?
> 
>  I've tried buidling with the same flags as I mentioned above with
> --enable-cgcdefault, but bad things to happen during the install (there are
> a lot of errors etc.). It still creates all the right files in my ${prefix}
> directory, but it seems to behave strangely (e.g. it takes drracket 5
> minutes to start.) Any direction is appreciated!
> 
> 
> Thanks!
> 
> Cody
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