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`

common/hooks/do-extract/00-distfiles.sh

@@ -70,8 +70,8 @@ hook() {
 		fi
 
 		case ${cursufx} in
-		txz|tbz|tlz|tgz|crate)
-			tar -x --no-same-permissions --no-same-owner -f $srcdir/$curfile -C $extractdir
+		tar|txz|tbz|tlz|tgz|crate)
+			bsdtar -x --no-same-permissions --no-same-owner -f $srcdir/$curfile -C $extractdir
 			if [ $? -ne 0 ]; then
 				msg_error "$pkgver: extracting $curfile into $XBPS_BUILDDIR.\n"
 			fi
@@ -84,12 +84,6 @@ hook() {
 				cd $extractdir && bunzip2 -f $curfile
 			fi
 			;;
-		tar)
-			tar -x --no-same-permissions --no-same-owner -f $srcdir/$curfile -C $extractdir
-			if [ $? -ne 0 ]; then
-				msg_error "$pkgver: extracting $curfile into $XBPS_BUILDDIR.\n"
-			fi
-			;;
 		zip)
 			if command -v unzip &>/dev/null; then
 				unzip -o -q $srcdir/$curfile -d $extractdir