[sledge] Fix exclude list for fmt_all make target

Summary: The llvm code to avoid formatting is now under `vendor` not `llvm`.

Reviewed By: da319

Differential Revision: D28907808

fbshipit-source-id: ae9444f49

sledge/Makefile

@@ -104,7 +104,7 @@ OCAMLFORMAT_ARGS =
 
 .PHONY: fmt_all
 fmt_all:
-	parallel $(OCAMLFORMAT_EXE) $(OCAMLFORMAT_ARGS) -i ::: $(shell find * \( -name _build -or -name llvm \) -not -prune -or \( -name '*'.ml -or -name '*'.mli \) -print 2>/dev/null)
+	parallel $(OCAMLFORMAT_EXE) $(OCAMLFORMAT_ARGS) -i ::: $(shell find * \( -name _build -or -name vendor \) -prune -or \( -name '*'.ml -or -name '*'.mli \) -print 2>/dev/null)
 
 # print any variable for Makefile debugging
 print-%: