Makefile: do not regenerate diet.h if it is existent - patched by Pancake. this also deletes diet.h for clean target

Makefile

@@ -135,7 +135,7 @@ PKGCFGF = $(LIBNAME).pc
 
 VERSION=$(shell echo `grep -e PKG_MAJOR -e PKG_MINOR CONFIG | grep -v = | awk '{print $$3}'` | awk '{print $$1"."$$2}')
 
-.PHONY: all clean install uninstall diet dist
+.PHONY: all clean install uninstall dist
 
 all: $(LIBRARY) $(ARCHIVE) $(PKGCFGF)
 	$(MAKE) -C tests
@@ -144,15 +144,15 @@ all: $(LIBRARY) $(ARCHIVE) $(PKGCFGF)
 $(LIBRARY): $(LIBOBJ)
 	$(CC) $(LDFLAGS) $(LIBOBJ) -o $(LIBRARY)
 
-$(LIBOBJ): diet
+$(LIBOBJ): include/diet.h
 
-# generate include/diet.h
-diet:
+# auto-generate include/diet.h
+include/diet.h:
 	@echo "// File auto-generated by Makefile for Capstone framework. DO NOT MODIFY!" > include/diet.h
+	@echo "" >> include/diet.h
 	@echo "#ifndef CAPSTONE_DIET_H" >> include/diet.h
 	@echo "#define CAPSTONE_DIET_H" >> include/diet.h
 	@echo "" >> include/diet.h
-	@echo "" >> include/diet.h
 ifneq (,$(findstring yes,$(CAPSTONE_DIET)))
 	@echo "// Capstone is in DIET mode" >> include/diet.h
 	@echo "#define CAPSTONE_DIET" >> include/diet.h
@@ -196,6 +196,7 @@ uninstall:
 clean:
 	rm -f $(LIBOBJ) lib$(LIBNAME).*
 	rm -f $(PKGCFGF)
+	rm -f include/diet.h
 	$(MAKE) -C bindings/python clean
 	$(MAKE) -C bindings/java clean
 	$(MAKE) -C bindings/ocaml clean