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postfix: fix build with gcc15
- add "-std=gnu17" to `ccargs`
Fixes build failure with gcc15:
```
In file included from flush_clnt.c:96:
./mail_params.h:17:13: error: 'bool' cannot be defined via 'typedef'
17 | typedef int bool;
| ^~~~
./mail_params.h:17:13: note: 'bool' is a keyword with '-std=c23' onwards
./mail_params.h:17:1: warning: useless type name in empty declaration
17 | typedef int bool;
| ^~~~~~~
```