[Issue 20120] libcurl.dll hangs when running std.net.curl unittests

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20120

--- Comment #4 from Rainer Schuetze <r.sagitario at gmx.de> ---
bisecting curl shows this commit as the offender:
https://github.com/curl/curl/commit/72d5e144fbc6a9db264ae425bb788af218f25d9e

defining DONT_USE_RECV_BEFORE_SEND_WORKAROUND when compiling curl lets the
std.net.curl unittests pass. Not sure who's to blame, though.

>From the discussions in the referenced issues, the curl developers were not too
convinced about the patch. Maybe it is also Windows version specific.

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