Merge bitcoin/bitcoin#33580: depends: Use $(package)_file_name when downloading from the fallback

671b774 depends: Use $(package)_file_name when downloading from the fallback (Ava Chow)

Pull request description:

  The server hosting the fallbacks uses `make download` so the files are only available with their overridden names rather than the original name on the upstream source. We should therefore also use the overridden name when downloading from the fallback.

  Fixes bitcoin-core/bitcoincore.org#1168

ACKs for top commit:
  theuni:
    utACK 671b774. I was going to PR the same change.
  janb84:
    ut ACK 671b774
  hebasto:
    ACK 671b774, tested with the following patch:

Tree-SHA512: ba010adb64900d8d748487cc1a658e2b163872354f4e7b38c4dfc37a14fcb22fec4379a635d2c6788c64dd46bef0d94aa3eb6f522ec700680e886d5468678031

Author: hebasto

depends/funcs.mk

@@ -37,7 +37,7 @@ endef
 
 define fetch_file
     ( $(call fetch_file_inner,$(1),$(2),$(3),$(4),$(5)) || \
-      $(call fetch_file_inner,$(1),$(FALLBACK_DOWNLOAD_PATH),$(3),$(4),$(5)))
+      $(call fetch_file_inner,$(1),$(FALLBACK_DOWNLOAD_PATH),$(4),$(4),$(5)))
 endef
 
 # Shell script to create a source tarball in $(1)_source from local directory