Move to /usr prefix.

- This is much more standard and replaces /image in sysa and is the
  standard in sysc (avoids many issues).
- GCC needs to have a file created for some unknown reason.
- Checksums updated.

sysa/libunistring-0.9.10/libunistring-0.9.10.sh

@@ -1,21 +0,0 @@
-# SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
-#
-# SPDX-License-Identifier: GPL-3.0-or-later
-
-src_prepare() {
-    find . -name '*.info*' -delete
-
-    # libunistring does not specify which gnulib snapshot was used,
-    # pick a random one that works
-    GNULIB_TOOL=../gnulib-52a06cb3/gnulib-tool ./autogen.sh
-
-    # autogen.sh does not regenerate libtool files
-    autoreconf-2.69 -fi
-}
-
-src_configure() {
-    ./configure \
-	--prefix="${PREFIX}" \
-	--libdir="${PREFIX}/lib/musl" \
-	--disable-shared
-}