Log message:
Mass-change BUILD_DEPENDS to TOOL_DEPENDS outside mk/.

Almost all uses, if not all of them, are wrong, according to the
semantics of BUILD_DEPENDS (packages built for target available for
use _by_ tools at build-time) and TOOL_DEPEPNDS (packages built for
host available for use _as_ tools at build-time).

No change to BUILD_DEPENDS as used correctly inside buildlink3.

As proposed on tech-pkg:
https://mail-index.netbsd.org/tech-pkg/2023/06/03/msg027632.html

Log message:
lang/gcc13-libs: import gcc13-libs-13.1.0nb1

The GNU Compiler Collection (GCC) includes front ends for C, C++, Objective-C,
Fortran, and Go, as well as libraries for these languages (libstdc++,
libgfortran, ...).

This packages provides GCC support libraries in a specific location and allows
packages to depend on just the libraries rather than having to pull in the full
GCC package.