Renamed android specific variables.
Added default path for jpeg specific library.
Updated documentation for android.
Fixed include paths and linking for jpeg library.
Updated build script, now also building jpeg library.
Fixed a problem when building openssl.
Copying libraries now to subfoler lib, because CMake searches for them there.
android build: updated ssl path variable

FREERDP_ANDROID_EXTERNAL_SSL_PATH -> FREERDP_EXTERNAL_SSL_PATH
Merge pull request #1629 from bmiklautz/update_pull_1609

Android jpeg build enhancement