[winlocks] Include stdlib.h to avoid crash in Windows

Chris Townsendrequested to merge
townsend2010/libssh-mirror:fix-winlocks-crash into master

With the missing include, VC makes assumptions about malloc(), free(), etc. in winlock's version of ssh_mutex_lock() which leads to a crash in InitializeCriticalSection().

Updates to the tests and documentation are not applicable with this small patch.

Checklist

  • Commits have Signed-off-by: with name/author being identical to the commit author
  • Code modified for feature
  • Test suite updated with functionality tests
  • Test suite updated with negative tests
  • Documentation updated

Reviewer's checklist:

  • Any issues marked for closing are addressed
  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTING.md
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code
Edited by Chris Townsend

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