add pure & const function attributes suggested by gcc -Wsuggest-attributeHEADmaster

This only covers the ones in the pre-written code.  There are many more
suggested in the generated code, which will require changing the generator
and will thus be handled separately.

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Part-of: <https://gitlab.freedesktop.org/xorg/lib/libxcb/-/merge_requests/64>

0 files changed, 0 insertions, 0 deletions