lib: restructure stdx headers and rename to opt, relocate example

Move stdx.hpp into a stdx/ subdirectory and rename to opt.hpp, reflecting
its specific purpose. Rename stdx.cc to opt.cc accordingly.

Update includes in both the library and examples to reflect the new path.

Also move must_pass.cc and its CMake config into examples/must_pass/ for
better organization and consistency.

No functional changes made.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

0 files changed, 0 insertions, 0 deletions