Fix the name of version.cc

version.cc was mistakenly included in the build file as versions.cc.

BUG=chromium:588220
TEST=emerge-${BOARD} chromeos-base/libchrome

Change-Id: Ic564b029b7ccd6005d8658d3aecddafac4c3370a
Reviewed-on: https://chromium-review.googlesource.com/361490
Commit-Ready: Greg Kerr <kerrnel@chromium.org>
Tested-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@google.com>
diff --git a/SConstruct b/SConstruct
index 195f635..5b413a7 100644
--- a/SConstruct
+++ b/SConstruct
@@ -218,7 +218,7 @@
                 tracked_objects.cc
                 tracking_info.cc
                 values.cc
-                versions.cc
+                version.cc
                 vlog.cc
                 """,
     'prefix' : 'base',