kbuild: Raise the minimum required binutils version to 2.21
It helps to use some new instructions directly in assembly code. Suggested-by:Andi Kleen <ak@linux.intel.com> Signed-off-by:
Chang S. Bae <chang.seok.bae@intel.com> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Reviewed-by:
Andi Kleen <ak@linux.intel.com> Acked-by:
Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Ravi Shankar <ravi.v.shankar@intel.com> Cc: Linux Torvalds <torvalds@linux-foundation.org> Cc: H. Peter Anvin <hpa@zytor.com> Link: https://lkml.kernel.org/r/1557309753-24073-5-git-send-email-chang.seok.bae@intel.com
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