Fix broken test configuration

googletest master seems to be different nowdays
let's lock on to an old release

Author: platisd

test/test_libs/CMakeLists.txt

@@ -5,7 +5,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           master
+  GIT_TAG           release-1.11.0
   SOURCE_DIR        "${CMAKE_BINARY_DIR}/googletest-src"
   BINARY_DIR        "${CMAKE_BINARY_DIR}/googletest-build"
   CONFIGURE_COMMAND ""