wfreerdp: fix gdi polyline mistake.
drdynvc: fix free invalid pointer.
wfreerdp: add winmm audin subsystem.
Merge pull request #1687 from zhangzl2013/audin-winmm

add winmm audin subsystem
Merge pull request #1686 from zhangzl2013/wfreerdp-bugfix

wfreerdp: fix gdi polyline mistake.