[Patch, fortran] [2/4] C binding access to C_PTR type: use gfc_get_iso_c_binding_dt

[Mikael Morin]

gen_cptr_param uses gfc_get_ha_symbol to retrieve the c_ptr symbol.
This is not safe to symbol renaming and to symbol hiding.
This patch changes it to use get_iso_c_binding_dt, which is the function used
elsewhere.
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2013-03-02  Mikael Morin  <mikael@gcc.gnu.org>

	* symbol.c (gen_cptr_param): Retrieve pointer type symbol using
	get_iso_c_binding_dt.
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