Ensure whitespaces are ignored by "git apply".
Ensure whitespaces are ignored by "git apply".

Line endings in the patch file(s) are creating issues on Windows:

```
thomas@MORGOTH MINGW64 /d/Documents/Development/ThirdParty/opencolorio/build/yaml-cpp (master)
$ git apply -v yaml-cpp-0.3.0.patch
build/yaml-cpp/yaml-cpp-0.3.0.patch:8: trailing whitespace.
set(YAML_COMPILE_FLAGS "-fPIC -fvisibility=hidden")
build/yaml-cpp/yaml-cpp-0.3.0.patch:9: trailing whitespace.
if(OCIO_INLINES_HIDDEN)
build/yaml-cpp/yaml-cpp-0.3.0.patch:10: trailing whitespace.
    set(YAML_COMPILE_FLAGS "${YAML_COMPILE_FLAGS} -fvisibility-inlines-hidden")
build/yaml-cpp/yaml-cpp-0.3.0.patch:11: trailing whitespace.
endif()
build/yaml-cpp/yaml-cpp-0.3.0.patch:12: trailing whitespace.

Checking patch build/yaml-cpp/CMakeLists.txt...
error: while searching for:
        ${contrib_private_headers}?
)?
?
set_target_properties(yaml-cpp PROPERTIES?
        VERSION "${YAML_CPP_VERSION}"?
        SOVERSION "${YAML_CPP_VERSION_MAJOR}.${YAML_CPP_VERSION_MINOR}"?
        PROJECT_LABEL "yaml-cpp ${LABEL_SUFFIX}"?
)?
?
if(IPHONE)?

error: patch failed: build/yaml-cpp/CMakeLists.txt:235
error: build/yaml-cpp/CMakeLists.txt: patch does not apply
```
AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO