utils.c: Include limits.h explicitly to fix build on musl

utils.c: Include limits.h explicitly to fix build on musl

Fixes:
| ../../alsa-utils-1.2.5/alsactl/utils.c: In function 'snd_card_clean_cfgdir':
| ../../alsa-utils-1.2.5/alsactl/utils.c:309:19: error: 'PATH_MAX' undeclared (first use in this function)
|   309 |         char path[PATH_MAX];
|       |                   ^~~~~~~~
| ../../alsa-utils-1.2.5/alsactl/utils.c:309:19: note: each undeclared identifier is reported only once for each function it appears in

Fixes: https://github.com/alsa-project/alsa-utils/pull/92
Signed-off-by: Andreas Müller <schnitzeltony@gmail.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>