wscript: refactoring, add waf_unit_test, disable -Wdouble-promotion, rename fast as fastnative and leave fast without -march=native for x-compiling

engine/wscript

@@ -21,7 +21,7 @@ def configure(conf):
 	# check for dedicated server build
 	if conf.options.DEDICATED:
 		if conf.env.DEST_OS == 'linux':
-			conf.check_cc( lib='rt' )
+			conf.check_cc(lib='rt')
 		conf.define('XASH_DEDICATED', 1)
 	elif conf.env.DEST_OS == 'android': # Android doesn't need SDL2
 		for i in ['android', 'log', 'EGL']:
@@ -87,7 +87,7 @@ def build(bld):
 		libs.append('RT')
 		if not bld.env.DEDICATED:
 			libs.append('ASOUND')
-	
+
 
 	# HACK: public headers must be put before common, so we don't get wrong mathlib included
 	includes = ['common', 'server', 'client', 'client/vgui', '.', '../public', '../common', '../pm_shared' ]