pkgconf: fix the build with GCC 14

Building pkgconf with GCC 14 currently fails with:
no option '-Wincompatible-pointer-types-discards-qualifiers'

This relaxes warnings for libpkgconf, pkgconf(1),

pkgconf: fix the build with GCC 14

Building pkgconf with GCC 14 currently fails with:
no option '-Wincompatible-pointer-types-discards-qualifiers'

This relaxes warnings for libpkgconf, pkgconf(1), and bomtool(1) until
the improvements are published upstream (see PR #444).

Co-authored-by: ngie
Approved by: ngie
Sponsored by: The FreeBSD Foundation
Event: Wiesbaden Hackathon 202604
Differential Revision: https://reviews.freebsd.org/D56591

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pkgconf: import into the base system

This introduces the following option:

* MK_PKGCONF: determines if pkgconf and bomtool should be built

The objective is to allow the creation of SBOM informatio

pkgconf: import into the base system

This introduces the following option:

* MK_PKGCONF: determines if pkgconf and bomtool should be built

The objective is to allow the creation of SBOM information while
building FreeBSD's src tree. The build system cannot rely on the
presence of bomtool (and eventually also spdxtool) in the build
environment, except for having it as part of the src tree directly.

The framework implementing the generation of SBOM files is under review
in D56474.

This will also help simplifying the build, with the introduction of
another framework relying on the availability of pkgconf.

Sponsored by: Alpha-Omega, The FreeBSD Foundation
Reviewed by: bapt, philip
Approved by: philip (mentor)
Differential Revision: https://reviews.freebsd.org/D56404

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