rust: Remove a rogue duplicate rust.cmake file

This only serves to confuse the cmake build tools into using the wrong
definitions, instead of the ones used in apps/system/rust.cmake.

Change-Id: Iaed204a8f8a9ae5fc2233dc4f9147ba6cf6a9a25
GitOrigin-RevId: 290682ee7b8eb7ad00a52f72c0f6e3be08e88673

rust.cmake

@@ -1,60 +0,0 @@
-# Fork of tools/seL4/cmake-tool/helpers/rust.cmake.
-#
-# The differences are that a) xargo has been replaced with cargo +nightly, since
-# xargo was upstreamed into Rust proper after seL4 created rust.cmake, and b)
-# the Rust target is hard-coded to riscv32imc-unknown-none-elf to make this
-# file easier to read.
-
-#
-# Copyright 2020, Data61, CSIRO (ABN 41 687 119 230)
-#
-# SPDX-License-Identifier: BSD-2-Clause
-#
-
-cmake_minimum_required(VERSION 3.8.2)
-include_guard(GLOBAL)
-
-# add_library but for rust libraries. Invokes cargo in the SOURCE_DIR that is provided,
-# all build output is placed in BUILD_DIR or CMAKE_CURRENT_BINARY_DIR if BUILD_DIR isn't provided.
-# lib_name: Name of library that is created
-# SOURCE_DIR: source directory of cargo project
-# BUILD_DIR: directory for cargo build output
-# TARGET: custom target to use. See in ../rust_targets/ for list of available targets.
-# LIB_FILENAME: filename of library created by cargo
-# DEPENDS: And target or file dependencies that need to be run before cargo
-function(RustAddLibrary lib_name)
-    cmake_parse_arguments(PARSE_ARGV 1 RUST "" "SOURCE_DIR;BUILD_DIR;TARGET;LIB_FILENAME" "DEPENDS")
-    if(NOT "${RUST_UNPARSED_ARGUMENTS}" STREQUAL "")
-        message(FATAL_ERROR "Unknown arguments to RustAddLibrary ${RUST_UNPARSED_ARGUMENTS}")
-    endif()
-    if("${RUST_SOURCE_DIR}" STREQUAL "")
-        message(FATAL_ERROR "SOURCE_DIR must be set for RustAddLibrary")
-    endif()
-    if("${RUST_LIB_FILENAME}" STREQUAL "")
-        message(FATAL_ERROR "LIB_FILENAME must be set for RustAddLibrary")
-    endif()
-    if("${RUST_BUILD_DIR}" STREQUAL "")
-        set(RUST_BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR})
-    endif()
-
-    add_custom_target(
-        ${libmain}_custom
-        BYPRODUCTS
-        ${RUST_BUILD_DIR}/${RUST_LIB_FILENAME}
-        ${USES_TERMINAL_DEBUG}
-        DEPENDS ${RUST_DEPENDS}
-        WORKING_DIRECTORY ${RUST_SOURCE_DIR}
-        COMMAND
-            ${CMAKE_COMMAND} -E env cargo +nightly build
-            --target riscv32imc-unknown-none-elf
-            --target-dir ${RUST_BUILD_DIR} -Z unstable-options
-            --out-dir ${RUST_BUILD_DIR}
-    )
-
-    add_library(${lib_name} STATIC IMPORTED GLOBAL)
-    set_property(
-        TARGET ${lib_name}
-        PROPERTY IMPORTED_LOCATION "${RUST_BUILD_DIR}/${RUST_LIB_FILENAME}"
-    )
-    add_dependencies(${lib_name} ${libmain}_custom)
-endfunction()