Some compiler warning fixes

----------------------------------------------------------------
Sascha Hauer (3):
      mips: remove unused variable
      sandbox: only test for sdl libs when sdl is enabled
      net gianfar: remove unused variable

 arch/mips/include/asm/mipsregs.h |    3 ---
 arch/sandbox/Makefile            |    7 +++++--
 drivers/net/gianfar.c            |    1 -
 3 files changed, 5 insertions(+), 6 deletions(-)

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