abuild fix for the amd serengeti_cheetah and the latest iasl version (trivial)

Signed-off-by: Corey Osgood <corey.osgood@gmail.com>
Acked-by: Corey Osgood <corey.osgood@gmail.com>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2982 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/mainboard/amd/serengeti_cheetah/Config.lb

@@ -90,7 +90,7 @@ if HAVE_ACPI_TABLES
         object fadt.o
 	makerule dsdt.c
 		depends "$(MAINBOARD)/dx/dsdt_lb.dsl"
-		action  "iasl -tc $(MAINBOARD)/dx/dsdt_lb.dsl"
+		action  "iasl -p $(PWD)/dsdt_lb -tc $(MAINBOARD)/dx/dsdt_lb.dsl"
 		action  "mv dsdt_lb.hex dsdt.c"
 	end
         object ./dsdt.o