Compile vmware_vga only once

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/default-configs/i386-softmmu.mak b/default-configs/i386-softmmu.mak
index 7780cf5..d60203f 100644
--- a/default-configs/i386-softmmu.mak
+++ b/default-configs/i386-softmmu.mak
@@ -3,6 +3,7 @@
 CONFIG_USB_OHCI=y
 CONFIG_VGA_PCI=y
 CONFIG_VGA_ISA=y
+CONFIG_VMWARE_VGA=y
 CONFIG_SERIAL=y
 CONFIG_PARALLEL=y
 CONFIG_I8254=y