build-sys: meson: Add some missing checks
- Header and function checks from
configure.ac
(some libc, some libpthread,dladdr
from libdl) - Find iconv and check
const
ness (similar toAM_ICONV
)
configure.ac
(some libc, some libpthread, dladdr
from libdl)const
ness (similar to AM_ICONV
)