Host `gcc6-gcc` will cause this error:
```
HOSTCC scripts/basic/fixdep
In file included from /usr/include/fortify/sys/select.h:26:0,
from /usr/include/sys/types.h:71,
from scripts/basic/fixdep.c:106:
/usr/include/fortify/fortify-headers.h:56:67: error: missing binary operator before token "("
#if _FORTIFY_SOURCE > 2 && defined __has_builtin && __has_builtin (__builtin_dynamic_object_size)
^
```
Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/8303>
Kidd Lee