add cross compiling for abuild.sh

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1913 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/mainboard/island/aruma/Options.lb

@@ -39,6 +39,7 @@ uses LINUXBIOS_EXTRA_VERSION
 uses _RAMBASE
 uses CC
 uses HOSTCC
+uses CROSS_COMPILE
 uses TTYS0_BAUD
 uses TTYS0_BASE
 uses TTYS0_LCS
@@ -170,7 +171,7 @@ default CONFIG_ROM_STREAM = 1
 ##
 ## The default compiler
 ##
-default CC="gcc -m32"
+default CC="$(CROSS_COMPILE)gcc -m32"
 default HOSTCC="gcc"
 
 ##