Subzero: Fix the cmake build.

BUG= none
R=mtrofin@chromium.org

Review URL: https://codereview.chromium.org/1041303002
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8db25d8..43f8e9c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,4 +18,10 @@
   -DALLOW_MINIMAL_BUILD=0
   )
 
+if(PNACL_BROWSER_TRANSLATOR)
+  add_definitions(-DPNACL_BROWSER_TRANSLATOR=1)
+else()
+  add_definitions(-DPNACL_BROWSER_TRANSLATOR=0)
+endif()
+
 target_link_libraries(pnacl-sz pthread)