fix build: avoid __ASSEMBLY__ as it's used in linux/types.h

[ocxtal]

I'm using archlinux (x86_64) and encountered build failure.

System:

% uname -a
Linux azalea 6.12.8-arch1-1 #1 SMP PREEMPT_DYNAMIC Thu, 02 Jan 2025 22:52:26 +0000 x86_64 GNU/Linux
% gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/15.1.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --enable-languages=ada,c,c++,d,fortran,go,lto,m2,objc,obj-c++,rust,cobol --enable-bootstrap --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://gitlab.archlinux.org/archlinux/packaging/packages/gcc/-/issues --with-build-config=bootstrap-lto --with-linker-hash-style=gnu --with-system-zlib --enable-__cxa_atexit --enable-cet=auto --enable-checking=release --enable-clocale=gnu --enable-default-pie --enable-default-ssp --enable-gnu-indirect-function --enable-gnu-unique-object --enable-libstdcxx-backtrace --enable-link-serialization=1 --enable-linker-build-id --enable-lto --enable-multilib --enable-plugin --enable-shared --enable-threads=posix --disable-libssp --disable-libstdcxx-pch --disable-werror
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.1.1 20250425 (GCC)
% 

Build log:

% make
g++ -c -g -O3 -msse4.2 -mpopcnt -fomit-frame-pointer -Wall   Assembly.cpp -o Assembly.o
In file included from /usr/include/bits/sched.h:63,
                 from /usr/include/sched.h:43,
                 from /usr/include/pthread.h:22,
                 from CommandLines.h:5,
                 from Assembly.h:3,
                 from Assembly.cpp:5:
/usr/include/linux/sched/types.h:99:9: error: ‘__u32’ does not name a type
   99 |         __u32 size;
      |         ^~~~~
/usr/include/linux/sched/types.h:101:9: error: ‘__u32’ does not name a type
  101 |         __u32 sched_policy;
      |         ^~~~~
/usr/include/linux/sched/types.h:102:9: error: ‘__u64’ does not name a type
  102 |         __u64 sched_flags;
      |         ^~~~~
/usr/include/linux/sched/types.h:105:9: error: ‘__s32’ does not name a type
  105 |         __s32 sched_nice;
      |         ^~~~~
/usr/include/linux/sched/types.h:108:9: error: ‘__u32’ does not name a type
  108 |         __u32 sched_priority;
      |         ^~~~~
/usr/include/linux/sched/types.h:111:9: error: ‘__u64’ does not name a type
  111 |         __u64 sched_runtime;
      |         ^~~~~
/usr/include/linux/sched/types.h:112:9: error: ‘__u64’ does not name a type
  112 |         __u64 sched_deadline;
      |         ^~~~~
/usr/include/linux/sched/types.h:113:9: error: ‘__u64’ does not name a type
  113 |         __u64 sched_period;
      |         ^~~~~
/usr/include/linux/sched/types.h:116:9: error: ‘__u32’ does not name a type
  116 |         __u32 sched_util_min;
      |         ^~~~~
/usr/include/linux/sched/types.h:117:9: error: ‘__u32’ does not name a type
  117 |         __u32 sched_util_max;
      |         ^~~~~
make: *** [Makefile:23: Assembly.o] Error 1
% head /usr/include/linux/sched/types.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_SCHED_TYPES_H
#define _LINUX_SCHED_TYPES_H

#include <linux/types.h>

#define SCHED_ATTR_SIZE_VER0    48      /* sizeof first published struct */
#define SCHED_ATTR_SIZE_VER1    56      /* add: util_{min,max} */

/*
% head /usr/include/linux/types.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_TYPES_H
#define _LINUX_TYPES_H

#include <asm/types.h>

#ifndef __ASSEMBLY__

#include <linux/posix_types.h>

% 

The __ASSEMBLY__ label used for include guard in Assembly.h, is also used in a linux header /usr/include/linux/types.h, and caused this build failure.