[Bug 257085] lang/racket: update to 8.1

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257085

            Bug ID: 257085
           Summary: lang/racket: update to 8.1
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: olgeni@FreeBSD.org
          Reporter: bsd@philippost.de
             Flags: maintainer-feedback?(olgeni@FreeBSD.org)
          Assignee: olgeni@FreeBSD.org

This patch updates lang/racket to version 8.1.

With Racket 8.0, the default backend was switched to an implementation based on
Chez Scheme. The old byte code interpreter is still supported.
The patch introduces two options -- BC and CS. I made them mutually exclusive,
even though Racket supports building and installing both backends
simultaneously. The CS backend is enabled by default.

The --enable-libffi and --enable-places options where added to BC_CONFIGURE_ON.
The CS backend configure script does not provide these options.

Racket claims to support the Chez Scheme backend on i386, amd64, armv6, aarch64
and powerpc
(https://github.com/racket/racket/blob/master/racket/src/ChezScheme/README.md)
on FreeBSD, but only amd64 and i386 seem to have machine types defined. I could
not test if the CS backend works on architectures other than amd64 and i386, or
which machine types the configure script chooses there.

According to the Racket documentation, JIT compilation is supported on 32 bit
PowerPC (c.f.
https://docs.racket-lang.org/guide/performance.html#%28part._.J.I.T%29). I
carried over the patch to src/bc/sconfig.h since I do not have access to
FreeBSD machines with architectures other than amd64 and i386.


This patch is based on the work by 'm.ne' in Bug 255529.

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