Add DragonflyBSD to supported builds (#20889)

BSD derivative with the same CRT as other BSDs.

Author: jhendrixMSFT

sdk/storage/azblob/CHANGELOG.md

@@ -12,6 +12,8 @@
 
 ### Other Changes
 
+* Add `dragonfly` to the list of build constraints for `blockblob`.
+
 ## 1.1.0-beta.1 (2023-05-09)
 
 ### Features Added

sdk/storage/azblob/blockblob/mmf_unix.go

@@ -1,6 +1,6 @@
-//go:build go1.18 && (linux || darwin || freebsd || openbsd || netbsd || solaris)
+//go:build go1.18 && (linux || darwin || dragonfly || freebsd || openbsd || netbsd || solaris)
 // +build go1.18
-// +build linux darwin freebsd openbsd netbsd solaris
+// +build linux darwin dragonfly freebsd openbsd netbsd solaris
 
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License. See License.txt in the project root for license information.