Summary: * arm-linux-gnueabihf and multilib support for linaro toolchain.

Details: 1. Make arm-linux-gnueabihf and multilib work together for linaro toolchain * Tuning the include and link path and order. * The build requires a sysroot with both soft and hard float support (Refer precise-sysroot-armhf-r0c.tar.bz2 at http://people.linaro.org/~michaelh/incoming/). With the sysroot, a reference multilib toolchain build is at http://people.linaro.org/~zhenqiangchen/ * Update the Makefiles in tests to support armv4t build. * Setup a pandaboard and run some tests.

Plans: * Investigate other code size regressions in 4.7. * Prepare for linaro binary toolchain 2012.05 release.

Best regards! -Zhenqiang