[Debian-med-packaging] Bug#911983: issues on architectures where char is unsigned (#15)

[Adrian Bunk]

This is a bug pattern that seems to be in many places in phast:
 ```
char c;
...
while ((c = (char)getopt_long(argc, argv, "i:o:s:e:l:G:r:T:a:g:c:C:L:I:A:M:O:w:N:Y:X:fuDVxPzRSk4mh", long_opts, &opt_idx)) != -1) {

```
The casts in commit 273b8ce6 silenced the warnings where the compiler was warning about this bug...

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