[gold patch] Fix usage of invalidated version string in Symbol_table::define_special_symbol

[Viktor Kutuzov]

Hi Ian,

I found that the Symbol_table::define_special_symbol method can return a
pointer to an invalidated version string from the local std::string
object (v) in case of condition only_if_ref == true. This patch should
fix this problem.

-Viktor.

	* symtab.cc (Symbol_table::define_special_symbol): Fix usage of
	the invalidated version string.
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