fixed getstatuschangeA rdp-return value in case of failure
drive hotpluging: register mounted drives already before first hotplug
fixed getstatuschangeW rdp-return value in case of failure
Make server sound thread optionnal

This patch makes the server-side sound channel thread optionnal, and
exposes functions to handle channel traffic from the outside.
Merge pull request #1937 from hardening/sound_optionnal_thread

Make server sound thread optional
Merge pull request #1901 from erbth/master_new

small SmartCard fix and drive redirection hotplug mechanism change
add YCoCg->RGB and 16-to-32bit SSE
Merge branch 'master' of https://github.com/dpoe/FreeRDP into egfx
libfreerdp-codec: don't use posix_memalign