message: Fixes a missing dependency of a slam example on gtest.
  One of the tiny hydro examples was using gtest, but did
  not guard against gtest being enabled.
diff: @@ -44,6 +44,7 @@ list(APPEND slam_tiny_hydro_tests_depends_on slam_tinyHydro_ex)
  #
  # Add gtest based tests for tinyHydro
  #
  +if(ENABLE_GTEST)
  blt_add_executable(
  NAME slam_tinyHydro_unitTests_ex
  SOURCES tests/slam_tinyHydro_unitTests.cpp
  @@ -54,7 +55,7 @@ blt_add_test(
  NAME slam_tinyHydro_unitTests
  COMMAND slam_tinyHydro_unitTests_ex
  )
  -
  +endif()
  #
  # Add the standalone executables for the sod example
  