Base.julia_cmd(): correctly forward the --sysimage-native-code=no flag if it is provided (#42185)

(cherry picked from commit f6b38a6)

Author: DilumAluthge

base/util.jl

@@ -187,6 +187,9 @@ function julia_cmd(julia=joinpath(Sys.BINDIR::String, julia_exename()))
     if opts.startupfile == 2
         push!(addflags, "--startup-file=no")
     end
+    if opts.use_sysimage_native_code == 0
+        push!(addflags, "--sysimage-native-code=no")
+    end
     return `$julia -C$cpu_target -J$image_file $addflags`
 end