Carefulcase eats words it can't generate

If the dictionary has

```xml

kakenekake

pc-anepc

PC-anePC

```
then we get
```sh
$ echo '^kake$ ^KAKE$ ^kake$'|lt-proc -C nob.autogen.bin
kakene kakene
```

I would like it to just fall back to "normal" generation for words it can't find exact case for, ie.

```sh
$ echo '^kake$ ^KAKE$ ^kake$'|lt-proc -C nob.autogen.bin
kakene KAKENE kakene
```

while still retaining the -C functionality for words it *can* find exact matches for
```sh
$ echo '^PC$ ^pc$' | lt-proc -C nob.autogen.bin
PC-ane pc-ane
```