cc1: warning: arch/xtensa/boot/include: No such file or directory

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6099776f9f268e61fe5ecd721f994a8cfce5306f
commit: 8939c58d68f97ce530f02d46c9f2b56c3ec88399 xtensa: add __umulsidi3 helper
date:   9 months ago
config: xtensa-allnoconfig (https://download.01.org/0day-ci/archive/20230909/202309091516.igMNktIu-lkp@xxxxxxxxx/config)
compiler: xtensa-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230909/202309091516.igMNktIu-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309091516.igMNktIu-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> cc1: warning: arch/xtensa/boot/include: No such file or directory [-Wmissing-include-dirs]
--
>> cc1: warning: arch/xtensa/boot/include: No such file or directory [-Wmissing-include-dirs]
>> arch/xtensa/boot/lib/zmem.c:8:6: warning: no previous prototype for 'exit' [-Wmissing-prototypes]
       8 | void exit (void)
         |      ^~~~
>> arch/xtensa/boot/lib/zmem.c:13:7: warning: no previous prototype for 'zalloc' [-Wmissing-prototypes]
      13 | void *zalloc(unsigned size)
         |       ^~~~~~
>> arch/xtensa/boot/lib/zmem.c:35:6: warning: no previous prototype for 'gunzip' [-Wmissing-prototypes]
      35 | void gunzip (void *dst, int dstlen, unsigned char *src, int *lenp)
         |      ^~~~~~

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