rdflib.c: add back timestamp size to header in library creation.
rdflib.c: add back timestamp size to header in library creation.

Commit 8dc965347 removed writing of the timestamp size to library
header. (Accidentally, I guess??) The attached patch adds it back.

Signed-off-by: H. Peter Anvin (Intel) <8a453bad9912ffe59bc0f0b8abe03df9be19379e@zytor.com>

techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm