cp-demangle.h: Declare cplus_demangle_operators...

libiberty:
	* cp-demangle.h: Declare cplus_demangle_operators,
	cplus_demangle_builtin_types, cplus_demangle_mangled_name, and
	cplus_demangle_type as static if IN_GLIBCPP_V3.
libobjc:
	* encoding.c: Rename target_flags with a #define to avoid
	conflict with a prior declaration.

From-SVN: r83800