bitbake: fetch/hg: Disable checksums for archived downloads

Like the Git fetcher, the Mercurial fetcher shouldn't expect recipes to
provide a checksum.  As described [1], recipes using a mercurial
fetcher that don't provide a checksum will fail in a the repository has
previously been downloaded and archived.

Credit to Rafaël Carré for figuring out the bug.

[1] https://www.mail-archive.com/openembedded-devel@lists.openembedded.org/msg41328.html

(Bitbake rev: 2df35a25b4968f64adfa673d5b73442c1a30829d)

Signed-off-by: Ash Charles <ashcharles@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/fetch2/hg.py

@@ -43,6 +43,13 @@ class Hg(FetchMethod):
         """
         return ud.type in ['hg']
 
+    def supports_checksum(self, urldata):
+        """
+        Don't require checksums for local archives created from
+        repository checkouts.
+        """ 
+        return False
+
     def urldata_init(self, ud, d):
         """
         init hg specific variable within url data