chore: use buildkit for builds (#295)

hack/scripts/cleanup.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+function remove_symlinks() {
+  set +e
+  for l in $(find ${PREFIX} -type l); do
+    readlink $l | grep -q /toolchain
+    if [ $? == 0 ]; then
+        echo "Unlinking $l"
+        unlink $l
+    fi
+  done
+  set -e
+}
+
+PREFIX="${1}"
+
+remove_symlinks
+find ${PREFIX} -type f -name \*.a -print0 | xargs -0 rm -rf
+find ${PREFIX}/lib ${PREFIX}/usr/lib -type f \( -name \*.so* -a ! -name \*dbg \) -exec strip --strip-unneeded {} ';'
+find ${PREFIX}/{bin,sbin} ${PREFIX}/usr/{bin,sbin,libexec} -type f -exec strip --strip-all {} ';'
+
+rm -rf \
+  ${PREFIX}/bin/getconf \
+  ${PREFIX}/bin/ldd \
+  ${PREFIX}/bin/mtrace \
+  ${PREFIX}/bin/gencat \
+  ${PREFIX}/bin/locale \
+  ${PREFIX}/bin/xtrace \
+  ${PREFIX}/bin/zic \
+  ${PREFIX}/bin/sln \
+  ${PREFIX}/bin/tzselect \
+  ${PREFIX}/bin/iconv \
+  ${PREFIX}/bin/sotruss \
+  ${PREFIX}/bin/ldconfig \
+  ${PREFIX}/bin/pldd \
+  ${PREFIX}/bin/iconvconfig \
+  ${PREFIX}/bin/localedef \
+  ${PREFIX}/bin/makedb \
+  ${PREFIX}/bin/pcprofiledump \
+  ${PREFIX}/bin/nscd \
+  ${PREFIX}/bin/sprof \
+  ${PREFIX}/bin/zdump \
+  ${PREFIX}/bin/getent \
+  ${PREFIX}/bin/scmp_sys_resolver \
+  ${PREFIX}/bin/catchsegv \
+  ${PREFIX}/lib/gconv/ \
+  ${PREFIX}/include/* \
+  ${PREFIX}/share/* \
+  ${PREFIX}/usr/include/* \
+  ${PREFIX}/usr/share/* \
+  ${PREFIX}/usr/libexec/getconf \
+  ${PREFIX}/var/db