common-user: Drop __linux__ around .note.GNU-stack

GNU-stack tagging is a toolchain issue, not an OS issue. All the
toolchains require this for ELF.

Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>

common-user/safe-syscall.S

@@ -22,6 +22,6 @@
  * assembly needs an executable stack and the whole QEMU binary will
  * needlessly end up with one. This should be the last thing in this file.
  */
-#if defined(__linux__) && defined(__ELF__)
+#if defined(__ELF__)
 .section        .note.GNU-stack, "", %progbits
 #endif