* cpplib.h, cpplib.c:  Remove support for !STATIC_BUFFERS.
* cpplib.c (special_symbol, do_once, do_include, cpp_get_token):
Compare cpp_buffer against CPP_NULL_BUFFER, not NULL.
* cpplib.c (dump_special_to_buffer):  New function.
(initialize_builtins):  Use it.

From-SVN: r12170