The number 1000000000 tries to have a voiceless velar
fricative, I think, which is NOT how sextillion is pronounced in
English.
```
espeak-ng -q -x 1000000000
w'0n sExt'Ili@n
```

$(srcdir) was missing on includes for src/include/espeak-ng/espeak-ng.h

$(srcdir) was missing on includes for src/include/espeak-ng/espeak-ng.h

Next PR removing rules which ,make sense for English, but should not be
present in the Polish language files.

So we can run tests parallel with cmake, reducing test time and IO
overhead

Fixes: #1823, #1824, #1825, #1826, #1827

- Add crash test and vectors provided by @SEU-SSL
- Disallow dummy/null voice load (that causes incorrect translator
initialization)
- Fix empty `phondata` file load (that causes unitialized memory access)
- Limit max word length for RemoveEnding (causes buffer overflow)
- Limit punctlist initialization from embedded commands (buffer
overflow)
- Fix unitialized pitch in wavegen (DBZ and indexing problems)
- Properly zeroize stack variables before use in TranslateClause and
SetWordStress

TODO (in nextup PR): add & fix more vectors from fuzzer.

This PR removes two unnecessary rules in Polish. They both make sense
for English (probably someone just copied them from the English file),
but make pronunciation of several Polish words incorrect.

Without this function declaration, the build fails on modern C compilers
(ISO C99). This affects e.g. builds on Apple Silicon. This fix is also
needed in order to compile
[rhasspy/piper](https://github.com/rhasspy/piper) on Apple Silicon.

Build error was:
```
/Users/leo/Development/piper/build/p/src/piper_phonemize_external-build/e/src/espeak_ng_external/src/libespeak-ng/speech.c:872:3: error: call to undeclared function 'TranslateClauseWithTerminator'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
  TranslateClauseWithTerminator(translator, NULL, NULL, terminator);
  ^
1 error generated.
```

Without this function declaration, the build fails on modern C compilers (ISO C99). This affects e.g. builds on Apple Silicon. This fix is also needed in order to compile rasspy/piper on Apple silicon

This PR fixes the pronunciation of "bateau" in English, per
[Wiktionary](https://en.wiktionary.org/wiki/bateau).

When looking for dotted abbreviations we must limit ourself to the size
of the buffer used for translating the abbreviation.

When looking for dotted abbreviations we must limit ourself to the size of
the buffer used for translating the abbreviation.