Also add stddef.h include to GpRenderedGlyphMetrics.h to make size_t
visible. Does MSVC provide size_t by default, or via stdint.h? This
prevents compilation and I can't see how this would have compiled on
Windows otherwise.
- Adds missing includes, removes some unused ones.
- Removes unused Windows.h and shellapi.h includes.
- Uses / as path separator. This is portable and should still work fine
on Windows.
Downgrades c++11-narrowing to a warning when compiling with Clang. A
better solution would be to fix the error, but this at least brings
Clang in line with the more permissive GCC, which treats this as a
warning by default.
The BUILD_INTERFACE generator expression isn't actually useful as we
don't use export(). CMAKE_CURRENT_SOURCE_DIR is also unnecessary as
CMake treats relative paths as relative to the current source directory
(or the current binary directory for outputs).
