Update release-candidate target

1. Rebuilds Unicode input table if necessary. (Ref: 3ef3792)

2. Sphinx doc build no longer terminates on warning. Unfortunately this
is necessary to ignore warnings from multiple method signatures for
Julia generic functions, which Sphinx warns about since they shouldn't
exist in Python.

[ci skip]

Makefile

@@ -53,15 +53,16 @@ debug release: | $(DIRS) $(build_datarootdir)/julia/base $(build_datarootdir)/ju
 release-candidate: release test
 	@#Check documentation
 	@./julia doc/NEWS-update.jl #Add missing cross-references to NEWS.md
+	@$(MAKE) -C doc unicode #Rebuild Unicode table if necessary
 	@./julia doc/DocCheck.jl > doc/UNDOCUMENTED.rst 2>&1 #Check for undocumented items
 	@if [ -z "$(cat doc/UNDOCUMENTED.rst)" ]; then \
 		rm doc/UNDOCUMENTED.rst; \
 	else \
 		echo "Undocumented functions found in doc/UNDOCUMENTED.rst; document them, then retry"; \
 		exit 1; \
 	fi
-	@$(MAKE) -C doc html  SPHINXOPTS="-W -n" #Rebuild Julia HTML docs pedantically
-	@$(MAKE) -C doc latex SPHINXOPTS="-W -n" #Rebuild Julia PDF docs pedantically
+	@$(MAKE) -C doc html  SPHINXOPTS="-n" #Rebuild Julia HTML docs pedantically
+	@$(MAKE) -C doc latex SPHINXOPTS="-n" #Rebuild Julia PDF docs pedantically
 	@$(MAKE) -C doc doctest #Run Julia doctests
 	@$(MAKE) -C doc linkcheck #Check all links
 	@$(MAKE) -C doc helpdb.jl #Rebuild Julia online documentation for help(), apropos(), etc...