Remove BOOST_ARCH_ARM for to_string definition
Remove BOOST_ARCH_ARM for to_string definition

Because even for x86 architecture to_string doesn't exist when building with the Android NDK, remove the test of the arm achitecture

Change-Id: Iefe825f31480af1a6c3cf9032d318d4b6331f46b

aldebaran/libqi,aldebaran/libqi,aldebaran/libqi