Cleanup: use lowercase function calls & macros in for CMake

This is already the case for most CMake usage.
Although some find modules are an exception to this, as they were
originally maintained externally they use some different conventions.

Also corrected bad indentation in: intern/cycles/CMakeLists.txt

tests/gtests/runner/CMakeLists.txt

@@ -27,7 +27,7 @@ else()
 endif()
 
 # This builds `bin/tests/blender_test`, but does not add it as a single test.
-BLENDER_SRC_GTEST_EX(
+blender_src_gtest_ex(
   NAME blender
   SRC "${SRC}"
   EXTRA_LIBS "${TEST_LIBS}"