[2.25 COMMITTED] [AArch64] Use hidden __GI__dl_argv in rtld startup code

[Szabolcs Nagy]

We rely on the symbol being locally defined so using extern symbol
is not correct and the linker may complain about the relocations.

2017-07-12  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* sysdeps/aarch64/dl-machine.h (RTLD_START_1): Change _dl_argv to the
	hidden __GI__dl_argv symbol.
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