xbps-src: base-chroot-v2 (reduce artifacts/deps)

This patchset contains multiple changes to xbps-src and
its required package "base-chroot" for building packages
via chroot.

- moved xbps.d(5) conf files to `etc/xbps.d`.
- renamed xbps.d(5) repository files to `etc/xbps.d/repos-{local,remote}*`.
- do not set `--repository` to any xbps command that supports it,
  xbps-src now simply populates `rootdir/etc/xbps.d` with correct
  settings (taking care of CHROOT_READY/IN_CHROOT).
- Unless `-C` is set (to preserve builddir/destdir/autodeps), when
  entering to the chroot (if CHROOT_READY is set), xbps-src will
  clean up the masterdir and then perform a system update to always
  use a constant set of packages for that exact date.
- Improved some normal/error msgs.
- Includes support for `xbps>=0.58`.
- common/hooks: switch to bsdtar.
- base-chroot:
  - base-chroot-musl is gone, now unified for glibc/musl.
  - deps removed: gettext, mpfr, readline, texinfo, which, xz.
  - deps changed: tar -> bsdtar.

Effectively this reduces dependencies in `base-chroot`, makes
it unified for musl and glibc, switches xbps-src to use `bsdtar`
rather than GNU `tar` and `xz`, gets rid of useless host dependencies
like GNU gettext, texinfo, etc.

I've been testing these changes for 1 month or so already,
I was able to build from scratch `base-system` for both native
and multiple targets, i.e `./xbps-src -a target -Nt pkg base-system`

etc/xbps.d/repos-local-x86_64.conf

@@ -0,0 +1,4 @@
+# DON'T EDIT THIS FILE
+# x86_64/glibc local repositories
+repository=/host/binpkgs/multilib
+repository=/host/binpkgs/multilib/nonfree

etc/xbps.d/repos-local.conf

@@ -0,0 +1,5 @@
+# DON'T EDIT THIS FILE
+# Local repositories
+repository=/host/binpkgs
+repository=/host/binpkgs/nonfree
+repository=/host/binpkgs/debug

etc/xbps.d/repos-remote-aarch64.conf

@@ -0,0 +1,4 @@
+# aarch64 voidlinux remote repositories
+repository=https://alpha.de.repo.voidlinux.org/current/aarch64
+repository=https://alpha.de.repo.voidlinux.org/current/aarch64/nonfree
+repository=https://alpha.de.repo.voidlinux.org/current/aarch64/debug

etc/xbps.d/repos-remote-musl.conf

@@ -0,0 +1,4 @@
+# voidlinux remote repositories (musl)
+repository=https://alpha.de.repo.voidlinux.org/current/musl
+repository=https://alpha.de.repo.voidlinux.org/current/musl/nonfree
+repository=https://alpha.de.repo.voidlinux.org/current/musl/debug

etc/xbps.d/repos-remote-x86_64.conf

@@ -0,0 +1,3 @@
+# voidlinux remote repositories (x86_64/glibc)
+repository=https://alpha.de.repo.voidlinux.org/current/multilib
+repository=https://alpha.de.repo.voidlinux.org/current/multilib/nonfree

etc/xbps.d/repos-remote.conf

@@ -0,0 +1,4 @@
+# voidlinux remote repositories (glibc)
+repository=https://alpha.de.repo.voidlinux.org/current
+repository=https://alpha.de.repo.voidlinux.org/current/nonfree
+repository=https://alpha.de.repo.voidlinux.org/current/debug