veyron/tools/playground: test.sh must also build wsprd.

Change-Id: I785f33340c58a226c9da3f4a1163761a1f4fa6df
diff --git a/tools/playground/test.sh b/tools/playground/test.sh
index 7e0dcdc..e7835a2 100755
--- a/tools/playground/test.sh
+++ b/tools/playground/test.sh
@@ -9,6 +9,7 @@
   "${GO}" build veyron/tools/identity || shell_test::fail "line ${LINENO}: failed to build 'identity'"
   "${GO}" build veyron/services/proxy/proxyd || shell_test::fail "line ${LINENO}: failed to build 'proxyd'"
   "${GO}" build veyron/services/mounttable/mounttabled || shell_test::fail "line ${LINENO}: failed to build 'mounttabled'"
+  "${GO}" build veyron/services/wsprd || shell_test::fail "line ${LINENO}: failed to build 'wsprd'"
   "${GO}" build veyron2/vdl/vdl || shell_test::fail "line ${LINENO}: failed to build 'vdl'"
   "${GO}" build veyron/tools/playground/builder || shell_test::fail "line ${LINENO}: failed to build 'builder'"
   "${GO}" build veyron/tools/playground/testdata/escaper || shell_test::fail "line ${LINENO}: failed to build 'escaper'"