ref: common: draft new static library, containing shared code for ref_gl and ref_soft

ref/common/wscript

@@ -0,0 +1,19 @@
+#! /usr/bin/env python
+# encoding: utf-8
+
+top = '.'
+
+def options(opt):
+	pass
+
+def configure(conf):
+	pass
+
+def build(bld):
+	bld.stlib(source = bld.path.ant_glob('*.c'),
+		target = 'ref_common',
+		includes = '.',
+		export_includes = '.',
+		use = 'engine_includes public werror',
+		subsystem = bld.env.MSVC_SUBSYSTEM
+	)