Missing updated sdkconfig.h for IDF 3.3

[AdrianSoundy]

Description

The LWIP was missing the feature for LWIP_SO_RCVBUF in the current build due to using an older version of sdkconfig.h from the IDF 3.3 library build.
`

Motivation and Context

• Fixes HTTP WebRequest throws SocketException Home#545

How Has This Been Tested?

With provided sample.
After fixing exception found the test still didn't work. The read stream timed out and there was no data. Found that the HttpWebResponse had a stream with 2 bytes but the stream read wasn't working.

Noticed in sample that it was getting the response again.
So changed it and it worked

var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                using (var stream = httpWebRequest.GetResponse().GetResponseStream())

to

 var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
               using (var stream = httpResponse.GetResponseStream())

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

Signed-off-by: adriansoundy [email protected]

[nfbot]

Hi @AdrianSoundy,

I'm nanoFramework bot.
Thank you for your contribution!

A human will be reviewing it shortly. 😉

[josesimoes]

Awesome! Looks like you've found other tweaks that were in order. 👍