[CMake] Trying to compile CMake on Cygwin with MS toolchain

[Robert Dailey]

I'm trying to compile CMake using the MSVC toolchain but it isn't working
when I configure for the first time. The relevant output is below. What do
I need to do to get this working? I installed all the packages in Cygwin
with the word 'curl' in it, but it still isn't working:

-- Performing Curl Test HAVE_FIONBIO
-- Performing Curl Test HAVE_FIONBIO - Failed
-- Performing Curl Test HAVE_IOCTLSOCKET
-- Performing Curl Test HAVE_IOCTLSOCKET - Failed
-- Performing Curl Test HAVE_IOCTLSOCKET_CASE
-- Performing Curl Test HAVE_IOCTLSOCKET_CASE - Failed
-- Performing Curl Test HAVE_SO_NONBLOCK
-- Performing Curl Test HAVE_SO_NONBLOCK - Failed
-- Performing Curl Test HAVE_O_NONBLOCKHAVE_GETHOSTBYADDR_R_5
-- Performing Curl Test HAVE_O_NONBLOCKHAVE_GETHOSTBYADDR_R_5 - Failed
-- Performing Curl Test HAVE_SOCKLEN_T
-- Performing Curl Test HAVE_SOCKLEN_T - Failed
-- Performing Curl Test HAVE_FILE_OFFSET_BITS
-- Performing Curl Test HAVE_FILE_OFFSET_BITS - Failed
-- Check size of curl_off_t
-- Check size of curl_off_t - failed
-- Performing Test curl_cv_recv
-- Performing Test curl_cv_recv - Failed
CMake Error at Utilities/cmcurl/CMake/OtherTests.cmake:89 (MESSAGE):
  Unable to link function recv
Call Stack (most recent call first):
  Utilities/cmcurl/CMakeLists.txt:662 (INCLUDE)
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