Compilation fix for libpng >= 1.6.0
Thanks to carstene1ns for the patch. Fixes #128
Fix g++ build introduced in pull #127
Remove extra qualification 'Window_ActorStatus::' on member 'DrawMinMax'
Merge pull request #129 from fdelapena/master

Build fixes
Remove variadic macro style to support older g++ versions.
Enable C++11 support for older g++ versions.
Fix linker errors in distros with --as-needed GNU linker parameter enabled by default (e.g. Ubuntu).
Merge pull request #130 from fdelapena/master

Compiler an linker fixes for popular distros
Merge remote-tracking branch 'easyrpg/master' into multiple_player