Improve handling of intermediate locale files.

Makefile

@@ -201,7 +201,6 @@ d3.dsv.js: \
 
 d3.time.js: \
 	src/time/time.js \
-	src/time/format-locale.js \
 	src/time/format-$(LOCALE).js \
 	src/time/format.js \
 	src/time/format-utc.js \
@@ -235,7 +234,7 @@ test: all
 
 d3%.js: Makefile
 	@rm -f $@
-	cat $(filter %.js,$(filter-out src/time/format-locale.js,$^)) | $(JS_BEAUTIFIER) > $@
+	cat $(filter %.js,$^) | $(JS_BEAUTIFIER) > $@
 	@chmod a-w $@
 
 package.json: src/package.js
@@ -243,8 +242,10 @@ package.json: src/package.js
 	node src/package.js > $@
 	@chmod a-w $@
 
-src/time/format-%.js:
+src/time/format-$(LOCALE).js: src/time/format-locale.js
 	LC_TIME=$(LOCALE) locale -ck LC_TIME | node src/time/format-locale.js > $@
 
+.INTERMEDIATE: src/time/format-$(LOCALE).js
+
 clean:
 	rm -f d3*.js package.json

src/time/format-en_US.js

@@ -1,10 +0,0 @@
-// The date and time format (%c), date format (%x) and time format (%X).
-var d3_time_formatDateTime = "%a %b %e %X %Y",
-    d3_time_formatDate = "%m/%d/%Y",
-    d3_time_formatTime = "%H:%M:%S";
-
-// The weekday and month names.
-var d3_time_days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],
-    d3_time_dayAbbreviations = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
-    d3_time_months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
-    d3_time_monthAbbreviations = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];