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.

sysc/texinfo-6.7/checksums

@@ -0,0 +1,8 @@
+6b7360dac62bb1fbfc1cb9a52aae4b4578802f7e936dedc57128637a9a3447ea  /usr/bin/install-info
+ce7a5fa1b123d2c04761a942d0786ff410330cd0428119fb477a5ee6cbde7b89  /usr/bin/makeinfo
+93fafa11310722900c521df7a831faa5827b542bad7feebbf2b3d67dc2c01ffe  /usr/bin/pdftexi2dvi
+3f75371015b97159399be11122a07c0b9e63386531eaa61a8ed9bb9f536c4b7d  /usr/bin/pod2texi
+ce7a5fa1b123d2c04761a942d0786ff410330cd0428119fb477a5ee6cbde7b89  /usr/bin/texi2any
+0f0a456c939940453e30668f23f5dbf9151d56088117ef03eec817d3e229f29d  /usr/bin/texi2dvi
+93fafa11310722900c521df7a831faa5827b542bad7feebbf2b3d67dc2c01ffe  /usr/bin/texi2pdf
+09490236e9a02747d0409c898d9a21abecfdf6612e755cb23954b378097b30f9  /usr/bin/texindex

sysc/texinfo-6.7/import-gnulib.sh

@@ -0,0 +1,37 @@
+#!/bin/sh
+
+# SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+../gnulib-b81ec69/gnulib-tool --import \
+    --lib=libgnu \
+    --source-base=gnulib/lib \
+    --m4-base=gnulib/m4 \
+    --doc-base=doc \
+    --tests-base=tests \
+    --aux-dir=build-aux \
+    --conditional-dependencies \
+    --no-libtool \
+    --macro-prefix=gl \
+    --no-vc-files \
+    argz \
+    getopt-gnu \
+    gettext-h \
+    iconv \
+    mbchar \
+    mbiter \
+    mbscasecmp \
+    mbschr \
+    mbslen \
+    mbsncasecmp \
+    mbsstr \
+    mbswidth \
+    memrchr \
+    regex \
+    stdarg \
+    strcasestr \
+    strdup-posix \
+    strerror \
+    vasprintf \
+    xalloc

sysc/texinfo-6.7/texinfo-6.7.sh

@@ -0,0 +1,15 @@
+# SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+src_prepare() {
+    find . -name '*.mo' -delete
+    find . -name '*.gmo' -delete
+
+    ../../import-gnulib.sh
+    autoreconf -fi
+}
+
+src_configure() {
+    ./configure --prefix="${PREFIX}"
+}