[PATCH, ARM AArch64] Remove the user namespace symbol 'start' from newlib and libgloss

[Yufeng Zhang]

Hi

This patch removes the symbol 'start' from newlib and libgloss in the 
ARM and AArch64 ports, as 'start' shall be a user namespace symbol.  The 
entry point is '_start' on elf systems.

Passed test on arm-none-eabi and aarch64-none-elf.

OK for the trunk?

Thanks,
Yufeng

libgloss/

	* aarch64/crt0.S: Remove 'start'.
	* arm/crt0.S: Ditto.
	* arm/redboot-crt0.S: Ditto.

newlib/

	* libc/sys/arm/crt0.S: Remove 'start'.
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