obstack: 64-bit obstack support, part 3 This finally enables full 64-bit obstack support. The glibc shared library specific code is removed from obstack.c too, and the error handling code conditionally compiled under control of another macro, _OBSTACK_NO_ERROR_HANDLER. * lib/obstack.h: Include string.h earlier. (_OBSTACK_INTERFACE_VERSION): Define. (_OBSTACK_SIZE_T, _CHUNK_SIZE_T): Define as size_t for version 2. * lib/obstack.c: Don't include shlib-compat.h. (OBSTACK_INTERFACE_VERSION): Delete. (_OBSTACK_ELIDE_CODE): Rename from ELIDE_CODE. Define when version 1 glibc code is compatible with version 2. Don't include stdio.h for __GNU_LIBRARY. (obstack_exit_failure, print_and_abort, obstack_alloc_failed_handler): Omit when _OBSTACK_NO_ERROR_HANDLER defined. Include stdio.h here. (_obstack_compat, _obstack, _obstack_newchunk, obstack_free): Delete glibc shared library specific source.

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