[AGPGART] Fix modular agpgart ia64 allmodconfig

My previous compat AGP patch broke modular AGPGART.

Test built on;

i386 CONFIG_AGP=y,m
x86_64 CONFIG_AGP=y
ia64 CONFIG_AGP=m
Signed-off-by: NZwane Mwaikambo <zwane@infradead.org>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDave Jones <davej@redhat.com>

drivers/char/agp/Makefile

 agpgart-y := backend.o frontend.o generic.o isoch.o
 
+agpgart-$(CONFIG_COMPAT)	+= compat_ioctl.o
+
 obj-$(CONFIG_AGP)		+= agpgart.o
-obj-$(CONFIG_COMPAT)		+= compat_ioctl.o
 obj-$(CONFIG_AGP_ALI)		+= ali-agp.o
 obj-$(CONFIG_AGP_ATI)		+= ati-agp.o
 obj-$(CONFIG_AGP_AMD)		+= amd-k7-agp.o