Only build hmac for zip.

core.mod/source.bmx

@@ -37,7 +37,6 @@ Import "libarchive/libarchive/archive_entry_strmode.c"
 Import "libarchive/libarchive/archive_entry_xattr.c"
 Import "libarchive/libarchive/archive_entry.c"
 Import "libarchive/libarchive/archive_getdate.c"
-Import "libarchive/libarchive/archive_hmac.c"
 Import "libarchive/libarchive/archive_options.c"
 Import "libarchive/libarchive/archive_pack_dev.c"
 Import "libarchive/libarchive/archive_pathmatch.c"

zip.mod/source.bmx

@@ -35,5 +35,6 @@ Import "../../net.mod/mbedtls.mod/mbedtls/include/*.h"
 Import "../core.mod/include/*.h"
 Import "../core.mod/libarchive/libarchive/*.h"
 Import "../core.mod/libarchive/libarchive/archive_cryptor.c"
+Import "../core.mod/libarchive/libarchive/archive_hmac.c"
 Import "../core.mod/libarchive/libarchive/archive_read_support_format_zip.c"
 Import "../core.mod/mods/archive_write_set_format_zip.c"