Pass -ffreestanding when compiling ifunc resolvers.

This flag prevents the compiler from inserting calls to libc functions in
the ifunc resolver code, which will definitely cause problems if the libc
function is itself an ifunc, but other calls that use the PLT may also be
affected, since libc may not have been fully resolved yet. As it turns out,
newer versions of clang will insert calls to memcmp in the body of the
init_cpu_variant() function in arch-arm/dynamic_function_dispatch.cpp.

Change-Id: I91f18d450835adc4b74565e9f48d5834f594a0c4

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