Rebuild musl 1.2.3 with support for dynamic linking

Now that GCC and binutils support musl's toolchain natively, musl can
have its dynamic linking support enabled without ill-effects.

sysc/musl-1.2.3/ld-musl-i386.path

@@ -0,0 +1 @@
+/usr/lib/musl

sysc/musl-1.2.3/musl-1.2.3.sh

@@ -0,0 +1,32 @@
+# SPDX-FileCopyrightText: 2022 Dor Askayo <dor.askayo@gmail.com>
+# SPDX-FileCopyrightText: 2022 Andrius Štikonas <andrius@stikonas.eu>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+urls="https://musl.libc.org/releases/musl-1.2.3.tar.gz"
+
+src_configure() {
+    ./configure \
+        --host=i386-unknown-linux-musl \
+        --prefix="${PREFIX}" \
+        --libdir="${PREFIX}/lib/musl" \
+        --includedir="${PREFIX}/include/"
+}
+
+src_compile() {
+    make CROSS_COMPILE=
+}
+
+src_install() {
+    default
+
+    # Make dynamic linker symlink relative in ${PREFIX}/lib
+    rm "${DESTDIR}/lib/ld-musl-i386.so.1"
+    rmdir "${DESTDIR}/lib"
+    mkdir -p "${DESTDIR}${PREFIX}/lib"
+    ln -sr "${DESTDIR}${PREFIX}/lib/musl/libc.so" "${DESTDIR}${PREFIX}/lib/ld-musl-i386.so.1"
+
+    # Add library search path configurtion
+    mkdir -p "${DESTDIR}/etc"
+    cp ../../ld-musl-i386.path "${DESTDIR}/etc"
+}