lib-sieve: Adjust to changes in mail-duplicate API.

src/lib-sieve/cmd-redirect.c

src/lib-sieve/plugins/duplicate/ext-duplicate-common.c

src/lib-sieve/plugins/duplicate/ext-duplicate-common.h

src/lib-sieve/plugins/duplicate/tst-duplicate.c

src/lib-sieve/plugins/vacation/cmd-vacation.c

src/lib-sieve/sieve-actions.c

src/lib-sieve/sieve-actions.h

src/lib-sieve/sieve-execute.c

src/lib-sieve/sieve-execute.h

src/lib-sieve/sieve-result.c

src/lib-sieve/sieve-result.h

src/lib-sieve/sieve-types.h

src/lib-sieve/sieve.c

src/plugins/imap-filter-sieve/imap-filter-sieve.c

src/plugins/imapsieve/imap-sieve.c

src/plugins/lda-sieve/lda-sieve-plugin.c

src/sieve-tools/sieve-test.c

src/testsuite/testsuite-script.c