cf-socket: enable Win10 TCP_KEEP* options with old SDKs
#19999
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Define
TCP_KEEP*macros if they are missing in Windows builds.To allow using these runtime
setsockopt()options regardless ofbuild-time SDK version, when running on Windows 10.0.16299+.
In practice in enables them for builds using mingw-w64 <12, and
MSVC with Windows SDK <10.
Before this patch these runtime options required building curl with
a recent toolchain.
Follow-up to f0de141 #19559