[gnutls-devel] GnuTLS | cppcheck skips most files in lib/ (#705)

[Development of GNU's TLS library]

New Issue was created.

Issue 705: https://gitlab.com/gnutls/gnutls/issues/705
Author:    Tim Rühsen
Assignee:  

Adding `--enable=information` and gives the following warning for most of our files in `lib/`:
```
noValidConfiguration:lib/algorithms/cert_types.c:0,information,This file is not analyzed. Cppcheck failed to extract a valid configuration. Use -v for more details.
```

Adding -v prints a lot stuff, mainly saying that cppcheck has a problem with `gl/c-ctype.h`.
```
The tested configurations have these preprocessor errors:\012HAVE_CONFIG_H=1 : [gl/c-ctype.h:78] #error "Only ASCII and EBCDIC are supported"
```

Setting `# define C_CTYPE_ASCII 1` hard-coded in `gl/c-ctype.h` (removing the #if check) seems to work out. Though cppcheck is extremely slow...

BTW, in `gitlab-ci.yml` the cppcheck option `-Ilib/include` should be `-Ilib/includes`.

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