Simplify bootstrap recipe

recipes/bootstrap/recipe.toml

@@ -5,18 +5,6 @@ git = "https://gitlab.redox-os.org/redox-os/bootstrap.git"
 template = "custom"
 script = """
 ARCH="$(echo "${TARGET}" | cut -d - -f1)"
-case "${ARCH}" in
-    i686)
-        NASM_FORMAT=elf32
-        ;;
-    *)
-        NASM_FORMAT=elf64
-        ;;
-esac
-nasm \
-    -o "${COOKBOOK_BUILD}/asm.o" \
-    -f "${NASM_FORMAT}" \
-    "${COOKBOOK_SOURCE}/src/${ARCH}.asm"
 cargo \
     -Zbuild-std=core,alloc,compiler_builtins \
     -Zbuild-std-features=compiler-builtins-mem rustc \
@@ -31,6 +19,5 @@ mkdir -v "${COOKBOOK_STAGE}/boot"
     -o "${COOKBOOK_STAGE}/boot/bootstrap" \
     --gc-sections \
     -T "${COOKBOOK_SOURCE}/src/${ARCH}.ld" \
-    "${COOKBOOK_BUILD}/asm.o" \
     "${COOKBOOK_BUILD}/${TARGET}/release/libbootstrap.a"
 """