tests/tcg: Use --noexecstack with assembler files

tests/tcg: Use --noexecstack with assembler files

Add the --noexecstack assembler command-line option to avoid:

  /usr/bin/ld: warning: boot.o: missing .note.GNU-stack section implies executable stack
  /usr/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker

which is enabled by default with current debian cross toolchains.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20240724010733.22129-2-richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240729144414.830369-4-alex.bennee@linaro.org>