Fix closing parenthesis

Reviewers: rwbarton, austin

Reviewed By: rwbarton, austin

Subscribers: rwbarton, thomie, carter, ezyang, simonmar

Differential Revision: https://phabricator.haskell.org/D309

driver/ghc.mk

@@ -10,7 +10,7 @@
 #
 # -----------------------------------------------------------------------------
 
-$(eval $(call all-target,driver,$(INPLACE_LIB)/ghc-usage.txt) $(INPLACE_LIB)/ghci-usage.txt)
+$(eval $(call all-target,driver,$(INPLACE_LIB)/ghc-usage.txt $(INPLACE_LIB)/ghci-usage.txt))
 
 $(INPLACE_LIB)/ghc-usage.txt: driver/ghc-usage.txt
 	cp $< $@