mariadb-10.[45]: Undefined symbols for architecture i386: "_my_atomic_add32"

[chrstphrchvz (Christopher Chavez)]

10.6_i386 builds of ​mariadb-10.4 and ​mariadb-10.5 fail during linking (it is difficult to tell exactly what fails due to the builds running with make -j4):

Undefined symbols for architecture i386:
  "_my_atomic_add32", referenced from:
      _my_register_filename in libmysys.a(my_open.c.o)
      _my_close in libmysys.a(my_open.c.o)
ld: symbol(s) not found for architecture i386

(I personally do not need these ports.)

[kencu (Ken)]

this will most likely be caused by this 58712.

We can ignore it (tempting, that's what we've done so far the past few years), change the clang build (should do, probably), or require and link in libatomic from gcc (that works too, but ugh).