security/pam-modules: Fix build with LLVM15, assume maintainership

Fix:

pam_innetgr.c:134:16: error: incompatible function pointer types passing 'int (char *, int)' to parameter of type 'int (*)(char *, size_t)' (aka 'int (*)(char *, unsigned long)') [-Wincompatible-function-pointer-types]

if (xgetname(getdomainname, &domainname)) {
             ^~~~~~~~~~~~~

pam_innetgr.c:65:16: note: passing argument to parameter 'getfn' here
xgetname(int (*getfn)(char *, size_t), char **storage)

^

1 warning and 1 error generated.

• [pam_innetgr.lo] Error code 1

While at it assume maintainership.