Remove an extraneous endif

BUG= None
R=dschuff@chromium.org

Review URL: https://codereview.chromium.org/1291913002 .
diff --git a/make/platform/clang_nacl.mk b/make/platform/clang_nacl.mk
index ec04bc9..dde7083 100644
--- a/make/platform/clang_nacl.mk
+++ b/make/platform/clang_nacl.mk
@@ -56,7 +56,6 @@
 endif
 endif
 endif
-endif
 
 endif