[Issue 18515] freebsd 11 ships with gcc unable to link 32 bit binaries, dmd uses it by default

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18515

--- Comment #2 from Jonathan M Davis <issues.dlang at jmdavisProg.com> ---
However, it does look like test/d_do_test.d hardcodes g++ if CC isn't set, so
that fails if g++ isn't available.

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