[gccgo] Portability for PPC target

[Ian Lance Taylor]

I committed these patches to the gccgo branch to avoid some warnings
promoted to errors when targeting PPC.

cc1plus: warnings being treated as errors
../../gccgo/gcc/go/expressions.cc: In member function 'virtual bool Builtin_call_expression::do_integer_constant_value(bool, __mpz_struct*, Type**) const':
../../gccgo/gcc/go/expressions.cc:4651:13: error: unused variable 'field'
../../gccgo/gcc/go/expressions.cc: In member function 'virtual void Type_conversion_expression::do_check_types(Gogo*)':
../../gccgo/gcc/go/expressions.cc:7898:47: error: comparison between signed and unsigned integer expressions
../../gccgo/gcc/go/expressions.cc:7903:45: error: comparison between signed and unsigned integer expressions

Ian


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