xbps-src: multiple performance improvements.

- use xbps-checkvers(1) to resolve dependencies.
- all dependencies are installed at once for the host and target.
- the `show-build-deps` target is now much faster.
- the `update-bulk/show-repo-updates` targets are now much faster.
- the `update-sys/show-sys-updates` targets are now much faster.
- the `bootstrap` target now works on musl hosts.
- simplified some loops.
- use cut(1) rather than awk(1) where applicable.
- multiple random changes to improve performance.

Based on work started by @Duncaen on https://github.com/void-linux/void-packages/pull/12433

Close https://github.com/void-linux/void-packages/pull/12433
Close https://github.com/void-linux/void-packages/pull/11282

common/xbps-src/shutils/pkgtarget.sh

@@ -54,6 +54,10 @@ remove_pkg_autodeps() {
     $XBPS_RECONFIGURE_CMD -a >> $tmplogf 2>&1
     echo yes | $XBPS_REMOVE_CMD -Ryod >> $tmplogf 2>&1
     rval=$?
+    if [ $rval -eq 0 ]; then
+        echo yes | $XBPS_REMOVE_CMD -Ryod >> $tmplogf 2>&1
+        rval=$?
+    fi
 
     if [ $rval -ne 0 ]; then
         msg_red "${pkgver:-xbps-src}: failed to remove autodeps: (returned $rval)\n"