Add BrowseIPPSOnly boolean directive and update man page

[abubakarsabir924-cell]

Added the BrowseIPPSOnly directive in conf.c and conf.h.
Implemented the filtering logic in scheduler/dirsvc.c for both registration and deregistration.
Verified that the code compiles successfully with make.
Updated the manual page cupsd.conf.5 with the new directive description.
The implementation ensures only IPPS services are advertised when the directive is enabled.

[abubakarsabir924-cell]

@michaelrsweet Sir! I have updated the PR with the following changes:
Added the BrowseIPPSOnly directive in conf.c and conf.h.
Implemented the filtering logic in scheduler/dirsvc.c for both registration and deregistration.
Verified that the code compiles successfully with make.
Updated the manual page cupsd.conf.5 with the new directive description.
The implementation ensures only IPPS services are advertised when the directive is enabled.

[michaelrsweet]

Some changes needed here...

The biggest thing seems to be testing BrowseIPPSOnly and the printer type to completely disable registration/deregistration. You want to test BrowseIPPSOnly in the dnssdRegisterPrinter function to determine whether to add the _ipp or _fax-ipp services but otherwise that should be all that is needed.

[abubakarsabir924-cell]

Ok Michael Sir, thank you for the detailed feedback!
Regarding the use of raw hex numbers: I initially used them because I ran into some compilation issues on GitHub with the constant, and I used the hex value as a temporary workaround. However, I completely understand why the constants are necessary for the codebase.
I am now updating the PR to remove the extern declaration, add the anchor comments in the man page, and move the logic into dnssdRegisterPrinter using the CUPS_PTYPE_xxx constants as you suggested.

I will ping you once the updated changes are ready for review. Thank you for your guidance sir!

[abubakarsabir924-cell]

@michaelrsweet Sir. I've moved the logic to the beginning of dnssdRegisterPrinter, replaced raw hex with CUPS_PTYPE_REMOTE, and added the man page anchor as requested.

[michaelrsweet]

Still need some changes...

[abubakarsabir924-cell]

Sir @michaelrsweet I've updated the PR with these specific fixes:
Comment Restored: Added the missing comment in cupsdDeregisterPrinter.

Logic Cleaned: Removed the redundant check on line 481.

Correct Wrapper: Wrapped the standard _ipp registration with if (!BrowseIPPSOnly) while keeping _ipps unconditional.

Verified: Confirmed the build works perfectly with make.

Please review and let me know if any further adjustments are needed to meet the project's standards,

[abubakarsabir924-cell]

Sir Also, I just pushed an additional commit to initialize the num_txt and txt variables. This fixes the 'uninitialized variable' error that was causing the CI build to fail. Now the build should be green!