gdb/c-exp.y: fprintf -> parser_fprintf

gdb/c-exp.y: fprintf -> parser_fprintf

Switching GDB to make use of gnulib's C++ namespace support mode
revealed these direct uses of fprintf in the C parser, where
parser_fprintf should be used to handle rewiring stderr to gdb_stderr:

 ..../src/gdb/c-exp.y: In function ‘void c_print_token(FILE*, int, YYSTYPE)’:
 ..../src/gdb/c-exp.y:3220:45: error: call to ‘fprintf’ declared with attribute warning: The symbol ::fprintf refers to the system function. Use gnulib::fprintf instead. [-Werror]
	  pulongest (value.typed_val_int.val));
					      ^
 ..../src/gdb/c-exp.y:3231:62: error: call to ‘fprintf’ declared with attribute warning: The symbol ::fprintf refers to the system function. Use gnulib::fprintf instead. [-Werror]
   fprintf (file, "tsval<type=%d, %s>", value.tsval.type, copy);
							       ^
 ..../src/gdb/c-exp.y:3237:57: error: call to ‘fprintf’ declared with attribute warning: The symbol ::fprintf refers to the system function. Use gnulib::fprintf instead. [-Werror]
	fprintf (file, "sval<%s>", copy_name (value.sval));
							  ^
 ..../src/gdb/c-exp.y:3243:39: error: call to ‘fprintf’ declared with attribute warning: The symbol ::fprintf refers to the system function. Use gnulib::fprintf instead. [-Werror]
	  copy_name (value.tsym.stoken));
					^
 ..../src/gdb/c-exp.y:3254:39: error: call to ‘fprintf’ declared with attribute warning: The symbol ::fprintf refers to the system function. Use gnulib::fprintf instead. [-Werror]
	  value.ssym.is_a_field_of_this);
					^
 ..../src/gdb/c-exp.y:3258:70: error: call to ‘fprintf’ declared with attribute warning: The symbol ::fprintf refers to the system function. Use gnulib::fprintf instead. [-Werror]
	fprintf (file, "bval<%s>", host_address_to_string (value.bval));
                                                                      ^

gdb/ChangeLog:
2016-11-17  Pedro Alves  <palves@redhat.com>

	* c-exp.y (c_print_token): Use parser_fprintf instead of fprintf.