libfreerdp-codec: implement planar codec RLE scanline encoding
libfreerdp-codec: start implementing delta-encoding of planar scanlines
libfreerdp-codec: get all steps of planar scanline delta encoding tested
libfreerdp-codec: compress and output RDP6 RLE planes
libfreerdp-codec: partial planar RLE compression support
libfreerdp-codec: simply planar RLE code
libfreerdp-codec: detect planar overflow per set of planes, not individual planes
libfreerdp-codec: improve planar RLE compression
libfreerdp-codec: reorganize planar RLE encoding logic
More security in gcc.c

As strange as it looks, i have found more errors that could lead to
security issues in gcc.c.
libfreerdp-codec: extend planar codec unit tests
libfreerdp-codec: add more planar unit tests
libfreerdp-codec: refactor planar decompression
libfreerdp-codec: make planar decoder more robust
Merge pull request #18 from hardening/gcc_fixes

More security in gcc.c
libwinpr-environment: fix usage of environ on OS X
Merge branch 'master' of github.com:awakecoding/FreeRDP
cmake: fix Android toolchain on 64-bit hosts
ifreerdp: fix iOS/OSX platform detection
libfreerdp-codec: make planar codec bitmap 01 pass the test