Merge pull request #1792 from awakecoding/master

Remove Unused Extension Framework
Remove config.h inclusion in debug.h

* update msusb to use DEBUG_MSUSB
* remove unused DEBUG_MSG
fix: build error while running client/X11/generate_argument_docbook

Author: Viacheslav Dubrovsk <dubrsl@altlinux.org>
Bug: https://github.com/FreeRDP/FreeRDP/issues/1481
Signed-off-by: Philippe Coval <philippe.coval@open.eurogiciel.org>
Merge pull request #1794 from eurogiciel/sandbox/pcoval/for-upstream

fix: build error while running client/X11/generate_argument_docbook
Merge pull request #1793 from bmiklautz/fix/config_h

Remove config.h inclusion in debug.h
Fix connection when no cookie is given

This patch corrects a regression introduced in 2edd8bee1208aef77f92209f737c376063681bf7
Merge pull request #1796 from hardening/nego_fix

Fix connection when no cookie is given
winpr/pipe: fix variable type - unsigned to signed

fcntl returns int. Comparison to 0 < always returned false.
remove re-declaration of extended pipe functions

remove them from winpr/pipe.h since they are defined and declared
in winpr/file.h
sample client: fix ReceiveChannelData prototype
sample server: fix printf format compiler warning
winpr: change GetKnownSubPath to use a const path
winpr-env: update Get/SetEnvironmentVariableA

* set last error to ERROR_ENVVAR_NOT_FOUND in GetEnvironmentVariableA
  if not found
* remove unused variables in SetEnvironmentVariableA
* add more test cases
transport: fix variable initialization

Fixes possible problem when NLA is enabled and header verification fails.
core/fastpath: fix compiler warning
Merge pull request #1798 from bmiklautz/fix/misc

Cleanup and fix compiler warnings
libfreerdp-codec: fix MPPC packet flushing criteria