create fallback gtest subproject dependency

Signed-off-by: Zane Shelley <zshelle@us.ibm.com>
Change-Id: I6b0ce32242a0a74b56f4a163cfb3a1e15fe8a7ee
diff --git a/subprojects/googletest.wrap b/subprojects/googletest.wrap
new file mode 100644
index 0000000..56da9ef
--- /dev/null
+++ b/subprojects/googletest.wrap
@@ -0,0 +1,3 @@
+[wrap-git]
+url = https://github.com/google/googletest
+revision = HEAD