Actually build DataFormatters dir. Fix for the r173732 fix.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@173840 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/source/Makefile b/source/Makefile
index 7f23af8..0f02f29 100644
--- a/source/Makefile
+++ b/source/Makefile
@@ -8,7 +8,7 @@
 ##===----------------------------------------------------------------------===##
 
 LLDB_LEVEL := ..
-DIRS := API Breakpoint Commands Core Expression Host Interpreter Plugins Symbol Target Utility
+DIRS := API Breakpoint Commands Core DataFormatters Expression Host Interpreter Plugins Symbol Target Utility
 LIBRARYNAME := lldbInitAndLog
 BUILD_ARCHIVE = 1