Fix unsis download link for make win-extras (#21608)

google code moved all the archived downloads around
(cherry picked from commit bc96f76)

Author: tkelman

Makefile

@@ -619,7 +619,7 @@ else
 endif
 	cd $(JULIAHOME)/dist-extras && \
 	$(JLDOWNLOAD) http://downloads.sourceforge.net/sevenzip/7z920_extra.7z && \
-	$(JLDOWNLOAD) https://unsis.googlecode.com/files/nsis-2.46.5-Unicode-setup.exe && \
+	$(JLDOWNLOAD) https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/unsis/nsis-2.46.5-Unicode-setup.exe && \
 	chmod a+x 7z.exe && \
 	chmod a+x 7z.dll && \
 	$(call spawn,./7z.exe) x -y -onsis nsis-2.46.5-Unicode-setup.exe && \