Fixes to makefile.

Merge C_ASM_DEP and DATA_ASM_DEP, NODEP and SCAN_DEPS can be overridden, add --no-print-directory to MAKEFLAGS in make_tools.mk (also removed some unused variables), add newline to help message in preproc.

make_tools.mk

@@ -1,12 +1,11 @@
 
+MAKEFLAGS += --no-print-directory
+
 TOOLDIRS := $(filter-out tools/agbcc tools/binutils,$(wildcard tools/*))
-TOOLBASE = $(TOOLDIRS:tools/%=%)
-TOOLS = $(foreach tool,$(TOOLBASE),tools/$(tool)/$(tool)$(EXE))
 
 .PHONY: all $(TOOLDIRS)
 
 all: $(TOOLDIRS)
-	@:
 
 $(TOOLDIRS):
 	@$(MAKE) -C $@