move: attrcmp() and attrlookup()
new file ssml.c added to Makefile.am

default spelling moved to the start of the group

A corpus of SSML input files will also be needed for fuzzing.
https://github.com/espeak-ng/espeak-ng/issues/407

Before this change, the clang compiler produced the following warning:

```
In file included from src/libespeak-ng/espeak_api.c:35:
src/libespeak-ng/event.h:65:28: warning: declaration of 'struct timespec' will
      not be visible outside of this function [-Wvisibility]
void clock_gettime2(struct timespec *ts);
                           ^
src/libespeak-ng/event.h:66:28: warning: declaration of 'struct timespec' will
      not be visible outside of this function [-Wvisibility]
void add_time_in_ms(struct timespec *ts, int time_in_ms);
                           ^
2 warnings generated.
```

Fixes #401.

The stray space confuses GitHub’s markdown parser.

Based on a patch by Valdis Vitolins <[email protected]>.

Based on a patch by Valdis Vitolins <[email protected]>.

allative case has a suffix of -lle. Normally it causes the doubling of the next word. However, enclitics should be treated like words in this case, so double the enclitic instead of the next word.

Sources for grammar rule:
http://scripta.kotus.fi/visk/sisallys.php?p=127
http://scripta.kotus.fi/visk/sisallys.php?p=34