compat: drop inclusion of <git-compat-util.h>

These two header files are included from ordinary source files that already include <git-compat-util.h> as the first header file as they should. There is no need to include the compat-util in these headers. "make hdr-check" is not affected, as it is designed to assume that what <git-compat-util.h> offers is available to everybody without being included. Signed-off-by: Junio C Hamano <gitster@pobox.com>