gtk+_2.20.1.bb: Ask for ARM_INSTRUCTION_SET to be 'arm'
gtk+_2.20.1.bb: Ask for ARM_INSTRUCTION_SET to be 'arm'

* It does not compile in thumb mode with gcc 4.5
  other version of gcc were not tested probably they
  many have problem too. For now always build using
  arm mode.

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

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