Compile vga-isa only once

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/Makefile.target b/Makefile.target
index 904ace5..54b6f0f 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -199,7 +199,7 @@
 # Hardware support
 obj-i386-y = ide/core.o ide/qdev.o ide/isa.o ide/pci.o ide/piix.o
 obj-i386-y += pckbd.o $(sound-obj-y) dma.o
-obj-i386-y += vga.o vga-isa.o
+obj-i386-y += vga.o
 obj-i386-y += fdc.o mc146818rtc.o serial.o i8259.o pc.o
 obj-i386-y += cirrus_vga.o apic.o ioapic.o acpi.o piix_pci.o
 obj-i386-y += usb-uhci.o vmmouse.o vmport.o vmware_vga.o hpet.o
@@ -230,7 +230,7 @@
 obj-mips-y = mips_r4k.o mips_jazz.o mips_malta.o mips_mipssim.o
 obj-mips-y += mips_addr.o mips_timer.o mips_int.o
 obj-mips-y += dma.o vga.o serial.o i8259.o rc4030.o
-obj-mips-y += vga-isa.o vga-isa-mm.o
+obj-mips-y += vga-isa-mm.o
 obj-mips-y += g364fb.o jazz_led.o dp8393x.o
 obj-mips-y += ide/core.o ide/qdev.o ide/isa.o ide/pci.o ide/piix.o
 obj-mips-y += gt64xxx.o pckbd.o fdc.o mc146818rtc.o usb-uhci.o acpi.o ds1225y.o