[Bug 259261] lang/mlton: Maintainer update to 20210816, and fix build for FreeBSD 12 and 13

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259261

            Bug ID: 259261
           Summary: lang/mlton: Maintainer update to 20210816, and fix
                    build for FreeBSD 12 and 13
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: beyert@cs.ucr.edu

File is attached (diff format).

Since this is a fix to another PR (noted below) and I am the port maintainer of
lang/mlton, this port should be committed in order to resolve that respective
PR.

I have updated to version 20210816 from the official github repository, and as
a result, this port once again builds properly on FreeBSD 11, 12 and 13, on
both i386 and amd64.

This version uses version and architecture specific bootstrap images, which I
host on my own repository on github.  Although building on i386 can be
notoriously difficult due to excessive memory usage, I have set the ram-slop
conditionals such that it should build properly under normal circumstances.  I
disable polyvariants on i386 to get slightly lower memory usage, which in many
cases is just barely enough to get a clean build.

I have verified that the build works on FreeBSD 11.4-RELEASE, FreeBSD
12.2-RELEASE, and FreeBSD 13.0-RELEASE, both both i386 and amd64 on each, for a
total number of 6 configurations.

Right now, I strongly recommend just using the default options, especially the
native MLton bootstrap, as I haven't used the SMLNJ in a long while (it is
extremely slow anyway), and I'm not entirely sure the POLYML option is
officially supported by the MLton developers yet.  Further, the MINGW32 build
is currently broken, but if someone can fix it, I will gladly incorporate a
patch (I'll look into it going forward).  None of these features are necessary
for full functionality on FreeBSD, fortunately.

Provided that this works for committers as well as it worked for me in testing,
this should fully address PR
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253607

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