Log message:
*: add LDFLAGS overide that was previously in mk

This is a workaround and should be fixed properly per-package - they
should use the pkgsrc LDFLAGS, but this restores what happened
before the mk/ cleanup.

Fixes relro build for packages that do not honor LDFLAGS.

Package list provided by mef@, thanks!

Workaround commit requested by bsiegert on tech-pkg.

Log message:
*: recursive bump for libmpg123 dependency in lame

Log message:
*: recursive bump for pcre2

Running an old binary against the new pcre doesn't work:
/usr/pkg/lib/libpcre2-8.so.0: version PCRE2_10.47 required by \ 
/usr/pkg/lib/libglib-2.0.so.0 not defined

Log message:
*: Assume that the user has a C99-capable compiler.

A compiler that supports -std=c99 is required for
bootstrap, so it doesn't make sense to specify a c99
compiler everywhere in package makefiles.

At any rate, I would bet my entire life's savings that
this is a small fraction of the total number of packages
requiring c99.

Note that compilers that default to c89 but support c99
are still supported...

Log message:
*: Recursive revbump from audio/flac-1.5.0

Log message:
blastem: Fix sound.

Log message:
* recursive bump for libxkbcommon 1.7.0

Marc Baudoin reported problems with using old binary packages
with the new libkxbcommon, so force everything to 1.7.0

Log message:
*: Recursive revbump from audio/pulseaudio-17.0