[ARM,testsuite] Make arm_arch_FUNC_ok more robust

[Christophe Lyon <christophe dot lyon at linaro dot org>]

Hi,

I'm resurrecting a patch I posted in 2012-09 :)

effective_target_arm_arch_FUNC_ok currently contains only
                #if !defined (DEF)
                #error FOO
                #endif
which is not sufficient for GCC to complain in case of an
unsupported flags combination.
For instance, -mfloat-abi=hard -mthumb -march=armv5te leads to:
sorry, unimplemented: Thumb-1 hard-float VFP ABI
but only if the compiler had actual code to compile.

Adding a dummy main() body in the arm_arch_FUNC_ok
effective target does the trick: with this patch, this effective
target test would fail, making the test unsupported rather
than failing later.

OK?

Christophe

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