wrapper: move xmmap() to sha1_file.c
wrapper.o depends on sha1_file.o for a number of reasons. One is release_pack_memory(). xmmap function calls mmap, discarding unused pack windows when necessary to relieve memory pressure. Simple git programs using wrapper.o as a friendly libc do not need this functionality. So move xmmap to sha1_file.o, where release_pack_memory() is. Signed-off-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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