Remove struct keyword in range-based for

Remove struct keyword in range-based for

I get the following error with gcc 6.3.0:

/home/simark/src/binutils-gdb/gdb/dwarf2read.c: In function 'void read_func_scope(die_info*, dwarf2_cu*)':
/home/simark/src/binutils-gdb/gdb/dwarf2read.c:13838:12: error: types may not be defined in a for-range-declaration [-Werror]
       for (struct symbol *sym : template_args)
            ^~~~~~

Removing the struct keyword fixes it.

gdb/ChangeLog:

	* dwarf2read.c (read_func_scope): Remove struct keyword in
	range-based for.