Compile benchmark programs without assertions. * modules/mbiter-bench-tests (Makefile.am): Compile bench-mbiter with -DNDEBUG. * modules/mbiterf-bench-tests (Makefile.am): Compile bench-mbiterf with -DNDEBUG. * modules/mbuiter-bench-tests (Makefile.am): Compile bench-mbuiter with -DNDEBUG. * modules/mbuiterf-bench-tests (Makefile.am): Compile bench-mbuiterf with -DNDEBUG. * modules/mbswidth-bench-tests (Makefile.am): Compile bench-mbswidth with -DNDEBUG. * modules/crypto/md5-buffer-tests (Makefile.am): Compile bench-md5 with -DNDEBUG. * modules/crypto/sha1-buffer-tests (Makefile.am): Compile bench-sha1 with -DNDEBUG. * modules/crypto/sha256-buffer-tests (Makefile.am): Compile bench-sha224 and bench-sha256 with -DNDEBUG. * modules/crypto/sha512-buffer-tests (Makefile.am): Compile bench-sha384 and bench-sha512 with -DNDEBUG.