libselinux: avc_internal.c: allow building with clang

Resolves the following errors from clang:
avc_internal.c:105:25: error: cast from 'char *' to 'struct nlmsghdr *' increases required alignment from 1 to 4 [-Werror,-Wcast-align]
        struct nlmsghdr *nlh = (struct nlmsghdr *)buf;
                               ^~~~~~~~~~~~~~~~~~~~~~
avc_internal.c:161:25: error: cast from 'char *' to 'struct nlmsghdr *' increases required alignment from 1 to 4 [-Werror,-Wcast-align]
        struct nlmsghdr *nlh = (struct nlmsghdr *)buf;
                               ^~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Stephen Smalley <[email protected]>
1 file changed