Merge pull request #2076 from awakecoding/egfx

MS-RDPEGFX Improvements
xfreerdp: use _aligned_free instead of free

Use _aligned_free to release memory allocated with
freerdp_image_convert().

Fixes #2075
Merge pull request #2080 from bmiklautz/issue/2079

xfreerdp: use _aligned_free instead of free
Merge branch 'master' of github.com:FreeRDP/FreeRDP into egfx