Add xbps-0.59.1.

This also required

- merging of usr/sbin and usr/bin (which should be done anyway), because
  of a dodgy PATH searcher
- moving of zlib earlier.

sysc/xbps-0.59.1/xbps-0.59.1.sh

@@ -0,0 +1,19 @@
+# SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+src_configure() {
+    PKG_CONFIG_PATH="${PREFIX}/lib/musl/pkgconfig" \
+        ./configure --prefix="${PREFIX}" \
+        --libdir="${PREFIX}/lib/musl" \
+        --pkgconfigdir="${PREFIX}/lib/musl/pkgconfig" \
+        --enable-rpath \
+        --enable-static
+    echo "CFLAGS += -Wno-error" >> config.mk
+}
+
+src_install() {
+    default
+
+    rm "${PREFIX}/lib/musl/libxbps.so"*
+}