Optimized Makefile a bit more

Now kernel binary is not recompiled on every run, 'make' checks if
files are changed.

Also deleted not needed sections of Makefile.

src/Makefile

@@ -34,17 +34,16 @@ DIRS = $(BUILDDIR)/arch/$(ARCH) $(BUILDDIR)/libk
 KERNELFILE = $(BUILDDIR)/orion.bin
 ISOFILE = $(BUILDDIR)/orion.iso
 
-.PHONY: all makedirs build link run run-grub clean
+.PHONY: all clean run run-grub
+.SUFFIXES: .o .c .asm
 
-all: makedirs build link
+all: $(DIRS) $(ASMOBJS) $(COBJS) $(LIBKOBJS) $(KERNELFILE)
 
-makedirs $(DIRS):
-	mkdir -p build/arch/$(ARCH)
-	mkdir -p build/libk
+$(DIRS):
+	mkdir -p $(BUILDDIR)/arch/$(ARCH)
+	mkdir -p $(BUILDDIR)/libk
 
-build: $(ASMOBJS) $(COBJS) $(LIBKOBJS)
-
-link: 
+$(KERNELFILE):
 	$(CC) -T linker.ld -o $(KERNELFILE) $(CFLAGS) -nostdlib $(OBJFILES) -lgcc
 
 $(BUILDDIR)/%.o: %.asm