linux-user: Rename TARGET_QEMU_ESIGRETURN to QEMU_ESIGRETURN

This value is fully internal to qemu, and so is not a TARGET define.

Reviewed-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

linux-user/hppa/cpu_loop.c

@@ -134,7 +134,7 @@ void cpu_loop(CPUHPPAState *env)
                 env->iaoq_b = env->gr[31] + 4;
                 break;
             case -QEMU_ERESTARTSYS:
-            case -TARGET_QEMU_ESIGRETURN:
+            case -QEMU_ESIGRETURN:
                 break;
             }
             break;