builtins.def (DEF_GCC_BUILTIN, [...]): Prepend "__builtin_" onto NAME with string concatenation.

	* builtins.def (DEF_GCC_BUILTIN, DEF_LIB_BUILTIN,
	DEF_EXT_LIB_BUILTIN, DEF_C99_BUILTIN, DEF_C99_C90RES_BUILTIN):
	Prepend "__builtin_" onto NAME with string concatenation.  Remove
	explicit "__builtin_" from each macro call.

	Reformat entire file.

From-SVN: r70057