Merge separate RGSS version build configs into one

Setup active RGSS version at runtime. Desired version can be
specified via config, or as default, auto detected from the game
files. This removes the need to build specifically for each
version, which should help packaging a lot.

This also greatly reduces the danger of introducing code that
wouldn't compile on all RGSS version paths (as certain code paths
were completely ifdef'd out).

This can be optimized more, eg. not compiling shaders that aren't
needed in the active version.

binding-mri/viewportelement-binding.h

@@ -23,6 +23,7 @@
 #define VIEWPORTELEMENTBINDING_H
 
 #include "viewport.h"
+#include "sharedstate.h"
 #include "binding-util.h"
 #include "binding-types.h"
 
@@ -39,8 +40,6 @@ RB_METHOD(viewportElementGetViewport)
 	return rb_iv_get(self, "viewport");
 }
 
-#ifdef RGSS2
-
 template<class C>
 RB_METHOD(viewportElementSetViewport)
 {
@@ -63,8 +62,6 @@ RB_METHOD(viewportElementSetViewport)
 	return viewportObj;
 }
 
-#endif
-
 template<class C>
 static C *
 viewportElementInitialize(int argc, VALUE *argv, VALUE self)
@@ -98,9 +95,10 @@ viewportElementBindingInit(VALUE klass)
 
 	_rb_define_method(klass, "viewport", viewportElementGetViewport<C>);
 
-#ifdef RGSS2
+	if (rgssVer >= 2)
+	{
 	_rb_define_method(klass, "viewport=", viewportElementSetViewport<C>);
-#endif
+	}
 }
 
 #endif // VIEWPORTELEMENTBINDING_H