target/nios2: Remove the deprecated Nios II target

The Nios II target is deprecated since v8.2 in commit 9997771bc1
("target/nios2: Deprecate the Nios II architecture").

Remove:
- Buildsys / CI infra
- User emulation
- System emulation (10m50-ghrd & nios2-generic-nommu machines)
- Tests

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: Marek Vasut <marex@denx.de>
Message-Id: <20240327144806.11319-3-philmd@linaro.org>

tests/docker/dockerfiles/debian-nios2-cross.d/build-toolchain.sh

@@ -1,87 +0,0 @@
-#!/bin/bash
-
-set -e
-
-TARGET=nios2-linux-gnu
-LINUX_ARCH=nios2
-
-J=$(expr $(nproc) / 2)
-TOOLCHAIN_INSTALL=/usr/local
-TOOLCHAIN_BIN=${TOOLCHAIN_INSTALL}/bin
-CROSS_SYSROOT=${TOOLCHAIN_INSTALL}/$TARGET/sys-root
-
-export PATH=${TOOLCHAIN_BIN}:$PATH
-
-#
-# Grab all of the source for the toolchain bootstrap.
-#
-
-wget https://ftp.gnu.org/gnu/binutils/binutils-2.37.tar.xz
-wget https://ftp.gnu.org/gnu/gcc/gcc-11.2.0/gcc-11.2.0.tar.xz
-wget https://ftp.gnu.org/gnu/glibc/glibc-2.34.tar.xz
-wget https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.70.tar.xz
-
-tar axf binutils-2.37.tar.xz
-tar axf gcc-11.2.0.tar.xz
-tar axf glibc-2.34.tar.xz
-tar axf linux-5.10.70.tar.xz
-
-mv binutils-2.37 src-binu
-mv gcc-11.2.0 src-gcc
-mv glibc-2.34 src-glibc
-mv linux-5.10.70 src-linux
-
-mkdir -p bld-hdr bld-binu bld-gcc bld-glibc
-mkdir -p ${CROSS_SYSROOT}/usr/include
-
-#
-# Install kernel and glibc headers
-#
-
-cd src-linux
-make headers_install ARCH=${LINUX_ARCH} INSTALL_HDR_PATH=${CROSS_SYSROOT}/usr
-cd ..
-
-cd bld-hdr
-../src-glibc/configure --prefix=/usr --host=${TARGET}
-make install-headers DESTDIR=${CROSS_SYSROOT}
-touch ${CROSS_SYSROOT}/usr/include/gnu/stubs.h
-cd ..
-
-#
-# Build binutils
-#
-
-cd bld-binu
-../src-binu/configure --disable-werror \
-  --prefix=${TOOLCHAIN_INSTALL} --with-sysroot --target=${TARGET}
-make -j${J}
-make install
-cd ..
-
-#
-# Build gcc, without shared libraries, because we do not yet
-# have a shared libc against which to link.
-#
-
-cd bld-gcc
-../src-gcc/configure --disable-werror --disable-shared \
-  --prefix=${TOOLCHAIN_INSTALL} --with-sysroot --target=${TARGET} \
-  --enable-languages=c --disable-libssp --disable-libsanitizer \
-  --disable-libatomic --disable-libgomp --disable-libquadmath
-make -j${J}
-make install
-cd ..
-
-#
-# Build glibc
-# There are a few random things that use c++ but we didn't build that
-# cross-compiler.  We can get away without them.  Disable CXX so that
-# glibc doesn't try to use the host c++ compiler.
-#
-
-cd bld-glibc
-CXX=false ../src-glibc/configure --prefix=/usr --host=${TARGET}
-make -j${j}
-make install DESTDIR=${CROSS_SYSROOT}
-cd ..