String format specifier do not work with cranelift backend.

[ghuls]

String format specifiers do not work with cranelift backend:

$ frawk -Binterp 'BEGIN { printf("%s", "test"); }'
test

$ frawk -Bcranelift 'BEGIN { printf("%s", "test"); }'
failure in runtime invalid type code passed to printf_impl_file: 2. Halting execution

[ghuls]

Fixed in commit: e4a96d1