create fallback gtest subproject dependency

Signed-off-by: Zane Shelley <zshelle@us.ibm.com>
Change-Id: I6b0ce32242a0a74b56f4a163cfb3a1e15fe8a7ee
diff --git a/.gitignore b/.gitignore
index 471453d..8d2357a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 *.sw*
 /build
+/subprojects/googletest
 /subprojects/libhei