message: Bump GoogleTest version
diff: -cmake_minimum_required(VERSION 2.8.2)
  +cmake_minimum_required(VERSION 2.8.12)
  project(googletest-download NONE)
  include(ExternalProject)
  ExternalProject_Add(googletest
  GIT_REPOSITORY https://github.com/google/googletest.git
  - GIT_TAG release-1.10.0
  + GIT_TAG a3460d1
  SOURCE_DIR "${FPRIME_FRAMEWORK_PATH}/gtest/googletest-src"
  BINARY_DIR "${FPRIME_FRAMEWORK_PATH}/gtest/googletest-build-${PLATFORM}"
  CONFIGURE_COMMAND ""
  