u-boot.inc: update linker arguments to pass --sysroot arg
If we are building from sstate-cache it's possible to be building
from another folder on another machine, therefore the linker requires
that a proper --sysroot is passed too it so it can find things like
libgcc.a and avoid errors such as:
| arm-poky-linux-gnueabi-gcc -g -O2 -fno-common -ffixed-r8 -msoft-float -D__KERNEL__ -DCONFIG_SYS_TEXT_BASE=0x80008000 -I/local/yocto/upstream/label/ubuntu1204-64b/machine/beagleboard/poky/edison/tmp/work/beagleboard-poky-linux-gnueabi/u-boot-v2011.06+git5+
b1af6f532e0d348b153d5c148369229d24af361a-r0/git/include -fno-builtin -ffreestanding -nostdinc -isystem /local/yocto/upstream/label/ubuntu1204-64b/machine/beagleboard/poky/edison/tmp/sysroots/x86_64-linux/usr/bin/armv7a-vfp-neon-poky-linux-gnueabi/../../lib/armv7a-vfp-neon-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/4.6.3/include -pipe -DCONFIG_ARM -D__ARM__ -marm -mabi=aapcs-linux -mno-thumb-interwork -march=armv5 -Wall -Wstrict-prototypes -fno-stack-protector -fno-toplevel-reorder -o hello_world.o hello_world.c -c
| arm-poky-linux-gnueabi-gcc -g -O2 -fno-common -ffixed-r8 -msoft-float -D__KERNEL__ -DCONFIG_SYS_TEXT_BASE=0x80008000 -I/local/yocto/upstream/label/ubuntu1204-64b/machine/beagleboard/poky/edison/tmp/work/beagleboard-poky-linux-gnueabi/u-boot-v2011.06+git5+
b1af6f532e0d348b153d5c148369229d24af361a-r0/git/include -fno-builtin -ffreestanding -nostdinc -isystem /local/yocto/upstream/label/ubuntu1204-64b/machine/beagleboard/poky/edison/tmp/sysroots/x86_64-linux/usr/bin/armv7a-vfp-neon-poky-linux-gnueabi/../../lib/armv7a-vfp-neon-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/4.6.3/include -pipe -DCONFIG_ARM -D__ARM__ -marm -mabi=aapcs-linux -mno-thumb-interwork -march=armv5 -Wall -Wstrict-prototypes -fno-stack-protector -fno-toplevel-reorder -o stubs.o stubs.c -c
| arm-poky-linux-gnueabi-ld -r -o libstubs.o stubs.o
| arm-poky-linux-gnueabi-ld -g -Ttext 0x80300000 \
| -o hello_world -e hello_world hello_world.o libstubs.o \
| -L. -lgcc
| arm-poky-linux-gnueabi-ld: cannot find -lgcc
| make[1]: *** [hello_world] Error 1
Signed-off-by: Matthew McClintock <msm@freescale.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
