rename built-in ISDN object to vmlinux-obj.o

(was isdn.a before, but there's no need to use an archive here)

Makefile

@@ -140,7 +140,7 @@ DRIVERS-y += drivers/base/base.o \
 DRIVERS-$(CONFIG_AGP) += drivers/char/agp/agp.o
 DRIVERS-$(CONFIG_DRM) += drivers/char/drm/drm.o
 DRIVERS-$(CONFIG_NUBUS) += drivers/nubus/nubus.a
-DRIVERS-$(CONFIG_ISDN) += drivers/isdn/isdn.a
+DRIVERS-$(CONFIG_ISDN) += drivers/isdn/vmlinux-obj.o
 DRIVERS-$(CONFIG_NET_FC) += drivers/net/fc/fc.o
 DRIVERS-$(CONFIG_APPLETALK) += drivers/net/appletalk/appletalk.o
 DRIVERS-$(CONFIG_TR) += drivers/net/tokenring/tr.o

drivers/isdn/Makefile

@@ -2,7 +2,7 @@
 
 # The target object and module list name.
 
-O_TARGET	:= isdn.a
+O_TARGET	:= vmlinux-obj.o
 
 # Objects that export symbols.