[Bug 256342] devel/msbuild: default targets are unusable with lang/mono5.20 and lang/mono6.8

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256342

--- Comment #3 from Jan Beich <jbeich@FreeBSD.org> ---
(In reply to Marcin Cieślak from comment #2)
> # ln -s ../../Current/bin/Roslyn /usr/local/lib/mono/msbuild/15.0/bin/Roslyn

I confirm, this fixes lang/mono5.20 while lang/mono6.8 needs more.

$ msbuild hello.csproj
Microsoft (R) Build Engine version 42.42.42.42 ( Tue Aug  1 17:21:05 UTC 2023)
for Mono
Copyright (C) Microsoft Corporation. All rights reserved.

Build started 8/7/2023 1:23:36 PM.
Project "/tmp/hello.csproj" on node 1 (default targets).
/usr/local/lib/mono/msbuild/15.0/bin/Roslyn/Microsoft.Managed.Core.targets(60,27):
error MSB4184: The expression ""hello.cs".GetPathsOfAllDirectoriesAbove()"
cannot be evaluated. Method 'System.String.GetPathsOfAllDirectoriesAbove' not
found. [/tmp/hello.csproj]
Done Building Project "/tmp/hello.csproj" (default targets) -- FAILED.

Build FAILED.

"/tmp/hello.csproj" (default target) (1) ->
 
/usr/local/lib/mono/msbuild/15.0/bin/Roslyn/Microsoft.Managed.Core.targets(60,27):
error MSB4184: The expression ""hello.cs".GetPathsOfAllDirectoriesAbove()"
cannot be evaluated. Method 'System.String.GetPathsOfAllDirectoriesAbove' not
found. [/tmp/hello.csproj]

    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:00.25

> Maybe we should go for a bold move an replace devel/msbuild with 16.9.0 (or later) and lang/mono with 6.12+

For games/openra 20200503 -> 20210321 (the latest is 20230225 but requires
dotnet instead of mono) I need at least lang/mono5.20 due to
https://github.com/openra/openra/commit/19b02875c7da
OpenBSD Ports has openra-20210321 with mono-6.12, so skipping 5.20 (and 6.8)
should be fine.

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