Avoid plain char for ctype macros #741
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On some platforms ctype functions are defined as macros accesing tables.
A plain char may be `signed` or `unsigned` per implementations and the
extension result implementation dependent.
gcc warns such case:
```
parser.c: In function 'rstring_cache_fetch':
parser.c:138:33: warning: array subscript has type 'char' [-Wchar-subscripts]
138 | if (RB_UNLIKELY(!isalpha(str[0]))) {
| ~~~^~~
parser.c: In function 'rsymbol_cache_fetch':
parser.c:190:33: warning: array subscript has type 'char' [-Wchar-subscripts]
190 | if (RB_UNLIKELY(!isalpha(str[0]))) {
| ~~~^~~
```
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On some platforms ctype functions are defined as macros accesing tables. A plain char may be
signedorunsignedper implementations and the extension result implementation dependent.gcc warns such case: