[ARM] Always decend into compressed and bootp subdirectories.

Make was missing the need to rebuild the kernel decompressor when
files in arch/arm/boot/compressed are changed.  This is because
make believes that the object contained within is up to date
(because it doesn't know any better.)  This cset always forces us
to decend into these two directories if the objects inside these
are required.

arch/arm/boot/Makefile

@@ -10,6 +10,11 @@
 
 SYSTEM	=$(TOPDIR)/vmlinux
 
+# Note: the following conditions must always be true:
+#   ZRELADDR == virt_to_phys(TEXTADDR)
+#   PARAMS_PHYS must be with 4MB of ZRELADDR
+#   INITRD_PHYS must be in RAM
+
 ifeq ($(CONFIG_CPU_26),y)
 ZRELADDR	 = 0x02080000
 PARAMS_PHYS	 = 0x0207c000
@@ -129,14 +134,14 @@ zImage:	compressed/vmlinux
 bootpImage: bootp/bootp
 	$(OBJCOPY) $(OBJCOPYFLAGS) $< $@
 
-compressed/vmlinux: $(TOPDIR)/vmlinux
+compressed/vmlinux: $(TOPDIR)/vmlinux FORCE
 	@$(MAKE) -C compressed vmlinux
 
-bootp/bootp: zImage initrd
+bootp/bootp: zImage initrd FORCE
 	@$(MAKE) -C bootp bootp
 
 initrd:
-	@test "$(INITRD_PHYS)" != "" || (echo This architecture does not support INITRD; exit -1)
+	@test "$(INITRD_PHYS)" != "" || (echo This machine does not support INITRD; exit -1)
 	@test "$(INITRD)" != "" || (echo You must specify INITRD; exit -1)
 
 install: Image
@@ -149,3 +154,5 @@ clean:
 	$(RM) Image zImage bootpImage
 	@$(MAKE) -C compressed clean
 	@$(MAKE) -C bootp clean
+
+FORCE: