* cpplib.c (cpp_init_internal_pragmas): Remove #pragma poison.
	* cppmacro.c (paste_all_tokens): Bad pastes are a hard error.
doc:
	* cpp.texi: Update for removal of obsolete features.
testsuite:
	* gcc.dg/cpp/poison.c: Update.
	* gcc.dg/cpp/20000625-2.c: Remove.
	* gcc.dg/cpp/direct2s.c: Remove final test.

From-SVN: r53333