m68knommu: use asflags instead of EXTRA_AFLAGS

Modify the extra asm flags for debugger capabilities, use asflags instead for
EXTRA_AFLAGS.  Suggestion from Sam Ravnborg.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/m68knommu/platform/5206/Makefile b/arch/m68knommu/platform/5206/Makefile
index c7bb0ce..a439d9a 100644
--- a/arch/m68knommu/platform/5206/Makefile
+++ b/arch/m68knommu/platform/5206/Makefile
@@ -12,9 +12,7 @@
 # EXTRA_AFLAGS += -DTRAP_DBG_INTERRUPT
 #
 
-ifdef CONFIG_FULLDEBUG
-EXTRA_AFLAGS += -DDEBUGGER_COMPATIBLE_CACHE=1
-endif
+asflags-$(CONFIG_FULLDEBUG) := -DDEBUGGER_COMPATIBLE_CACHE=1
 
 obj-y := config.o