Remove included bin/waf

Makefile

@@ -1,13 +1,11 @@
-CC := gcc
-
 all:
-	@bin/waf build
+	@waf build
 
 clean:
-	@bin/waf clean
+	@waf clean
 
 distclean:
-	@bin/waf distclean
+	@waf distclean
 	@rm tags
 
 ctags:
@@ -16,7 +14,6 @@ ctags:
 coverity:
 	@if [ -d cov-int ]; then rm -rf cov-int;fi
 	@mkdir cov-int
-	@cov-build --dir=cov-int bin/waf configure clean build
+	@cov-build --dir=cov-int waf configure clean build
 	@tar cvzf coverity_siahsd.tgz cov-int
 	@rm -rf cov-int
-