SFTtech/openage — pull request #78 by janisozaur (2014-11-01 23:06:25+00:00)
Title: use $(MAKE) variable in main Makefile

Using special $(MAKE) variable has some benefits over explicitly calling
'make'.
When using this variable, make knows automatically to pass some of its
arguments to lower-level invocations.
Among other features, this enables multi-threaded building from top-dir.