c-common.c (cb_register_builtins): If C++, define __EXCEPTIONS, __DEPRECATED and __GXX_ABI_VERSION as appropriate.

	* c-common.c (cb_register_builtins): If C++, define
	__EXCEPTIONS, __DEPRECATED and __GXX_ABI_VERSION as appropriate.
	* gcc.c (cpp_unique_options): Remove __GXX_ABI_VERSION.
cp:
	* lang-specs.h: Simplify in accordance with new code in
	c-common.c.

From-SVN: r55924