Remove executable flag from the build configuration files

They're not intended to be executed directly and seems mode change happened
by accident.

Setting -x for this files to avoid possible incidents by trying to run this
files in shell.

diff --git a/build_files/scons/tools/Blender.py b/build_files/scons/tools/Blender.py
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/source/creator/CMakeLists.txt b/source/creator/CMakeLists.txt
old mode 100755 (executable)
new mode 100644 (file)