ref: #1554
ref for buffer size:
a6fb239208/source/synthDrivers/_espeak.py (L338)

ref: #1554
ref for buffer size: a6fb239208/source/synthDrivers/_espeak.py (L338)

Ref: #1549

Contribute to #68 

Reduce number of externs and static-returns

- Add more compilers - especially GCC on macOS and Clang.
- Add more architectures - especially RISC-V-64
- Move build outside of QEMU (use cross-compilation)
- Use qemu-user for test on target environment
- Add Android CI with APK artifacts

Found with pmd-cpd scanner. The new function could probably be named better.

Contribute to #68

Tidying up a data source bundle, that is embedded e.g. in iOS app

Contribute to #68

Reduce count of globals / externs that could be a file-local static
variables

Fixes #1232

Contribute to #68

compiledict.c is clean from global state now

```bash
nm -C -l -fbsd src/libespeak-ng/la-compiledict.o | grep -E ' b | B '
```

Contribute to #68

compiledata.c is clean from global state now

```bash
nm -C -l -fbsd src/libespeak-ng/la-compiledata.o | grep -E ' b | B '
```

Move a code that should be shared outside HAVE_SONIC_H ifdef.

That also simplifies prosody SSML tests (made by @sthibaul) by removing
unnecessary cases.

Ref: #1512 #1368

Fixes #1528 

Now, `klatt` and `breath`-enabled variants may be added to tests