build-kernel.sh: Use GCC 4.9 automatically for Mips64 build.

+ Fix the auto-generated README file to mention "mips64" instead
  of "mips".

Change-Id: I2fecb008398979612f440271a028921900311f78
1 file changed
tree: 8b1a4487c61a2d3c9c416fde118f434491e3f559
  1. arm/
  2. arm64/
  3. build-kernel.sh
  4. kernel-toolchain/
  5. mips/
  6. mips64/
  7. x86/
  8. x86_64/