shallow: remove unused #include "sigchain.h"
After switching to use the tempfile module in commit 6e122b44 (setup_temporary_shallow(): use tempfile module), no declarations from sigchain.h are used in read-cache.c anymore. Thus, remove the #include. Signed-off-by: NTobias Klauser <tklauser@distanz.ch> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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