[PATCH] ahc1542 !CONFIG_MCA build fix

The old 1542 scsi driver is both ISA and MCA.  The MCA portions are disabled
when !CONFIG_MCA through the typical wrapper scheme (a la pci.h and
!CONFIG_PCI).  However...  the driver unconditionally includes linux/mca.h
which in turn unconditionally includes asm/mca.h.

This breaks drivers on platforms with ISA but not MCA, like alpha.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/mca.h

@@ -12,7 +12,9 @@
 #include <linux/device.h>
 
 /* get the platform specific defines */
+#ifdef CONFIG_MCA
 #include <asm/mca.h>
+#endif
 
 /* The detection of MCA bus is done in the real mode (using BIOS).
  * The information is exported to the protected code, where this