win32: TCP_MAXSEG isn't available for setsockopt

[tbreeds]

According to [1,2] Windows platforms support getsockopt(TCP_MAXSSEG) but not setsockopt(TCP_MAXSEG) on IPPROTO_TCP sockets. This results in:

socket.error: [Errno 10042] An unknown, invalid, or unsupported option or level was specified in a getsockopt or setsockopt call

when trying to connect to the server.

This is a latent issue uncovered by the refactor in:
Set default KEEPIDLE/KEEPCNT/KEEPINTVL and TCP_USER_TIMEOUT (b14962c)

[1] https://msdn.microsoft.com/en-us/library/windows/desktop/ms740476(v=vs.85).aspx
[2] https://msdn.microsoft.com/en-us/library/windows/desktop/ms738544(v=vs.85).aspx

[tbreeds]

Fixes #135

@BCLAU Can you check this works for you?

[codecov-io]

Codecov Report

Merging #136 into master will decrease coverage by -0.16%.
The diff coverage is 40%.

@@            Coverage Diff             @@
##           master     #136      +/-   ##
==========================================
- Coverage   91.84%   91.69%   -0.16%     
==========================================
  Files          14       14              
  Lines        1644     1649       +5     
  Branches      224      226       +2     
==========================================
+ Hits         1510     1512       +2     
- Misses        106      107       +1     
- Partials       28       30       +2

Impacted Files	Coverage Δ
amqp/platform.py	64.1% <33.33%> (-2.57%)	❌
amqp/transport.py	71.71% <50%> (-0.18%)	❌

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[claudiubelu]

Sorry, for the delay.

Yep, thanks Tony, this looks fine: http://64.119.130.115/nova/442295/11/

[tbreeds]

\o/ Thanks!

[claudiubelu]

Thank you as well. :D