Fixed type of stack trace variables.
libfreerdp-codec: fix mppc decompression

* protect against history buffer overflows
* fix replicating copy (CopyOffset can be > HistoryBufferSize!)
Merge pull request #2199 from akallabeth/backtrace_fix

Fixed type of stack trace variables.
core: use zero padding in suppress output pdu

Some legacy rdp servers seem to expect a zero padding after the
allowDisplayUpdates byte, probably because they incorrectly parse the
value as uint32.
Merge pull request #2210 from nfedera/fix-2014-11-14-01

core: use zero padding in suppress output pdu
Merge pull request #2206 from nfedera/fix-2014-11-12-01

libfreerdp-codec: fix mppc decompression
android: update toolchain file to support ndk 10c
android: use target SDK version for appcompat

Also Use ANDROID_APP_TARGET_SDK for application compatibility project.
It is now automatically set/updated during build.

Note: The ANDROID_APP_TARGET_SDK version need to be larger or equal to the
version required by the used Android support library (appcompat).
android: update documentation

Add Android support library to requirements.
android: update target sdk to 21

Use latest SDK platform (android-21) per default.