Run the `clang-format.bash` script to update all our C and C++ code to a
new style defined by `.clang-format`, now with "east const" enforcement.
Use `clang-format` version 18.
* If you reached this commit for a line in `git blame`, re-run the blame
operation starting at the parent of this commit to see older history
for the content.
* See the parent commit for instructions to rebase a change across this
style transition commit.
Issue: #26123
The Xlib interface to the Xpresent extension was missing from the FindX11 module, so I put it in. The xcb interface is already present.
Xpresent project page: https://gitlab.freedesktop.org/xorg/lib/libxpresent
By using clang-format directives 'IncludeBlocks' and 'IncludeCategories'
headers are regrouped by categories:
1. "cmConfigure.h" which must be first
2. header matching current implementation file
3. standard language headers
4. CMake replacement ones
5. external headers (i.e. #include directive with '<' and '>')
6. Qt headers
7. cmsys/* headers
8. cm_* headers
9. CMake headers (i.e. starting with 'cm[A-Z]')
10. all other headers
Fixes: #19674
