Use more appropriate error message

Sometimes certain drivers do not have the capability required to
initialize the graphics subsystem (mesa currently, for example).
Instead of saying "your hardware is too old", state that the drivers may
also be at fault.

obs/window-basic-main.cpp

@@ -548,9 +548,9 @@ void OBSBasic::OBSInit()
 	case OBS_VIDEO_MODULE_NOT_FOUND:
 		throw "Failed to initialize video:  Graphics module not found";
 	case OBS_VIDEO_NOT_SUPPORTED:
-		throw "Failed to initialize video:  Your graphics adapter "
-		      "is either too old or does not have the required "
-		      "capabilities required for this program";
+		throw "Failed to initialize video:  Required graphics API "
+		      "functionality not found on these drivers or "
+		      "unavailable on this equipment";
 	case OBS_VIDEO_INVALID_PARAM:
 		throw "Failed to initialize video:  Invalid parameters";
 	default: