This patch force the usage of `-std=gnu18` for GCC15 toolchains to fix
the following issues:
- The boolean issue with C23
```
In file included from ../../src/i_sound.h:38,
from i_sound.c:58:
../../src/doomtype.h:48:15: error: cannot use keyword ‘false’ as enumeration constant
48 | typedef enum {false, true} boolean;
| ^~~~~
../../src/doomtype.h:48:15: note: ‘false’ is a keyword with ‘-std=c23’ onwards
```
- The usage of `usleep` & `struct timezone` require usage of GNU
extensions.
```
i_system.c:58:3: error: implicit declaration of function ‘usleep’; did you mean ‘sleep’? [-Wimplicit-function-declaration]
58 | usleep(usecs);
| ^~~~~~
| sleep
i_system.c: In function ‘I_GetTime_RealTime’:
i_system.c:78:19: error: storage size of ‘tz’ isn’t known
78 | struct timezone tz;
| ^~
i_system.c: In function ‘I_GetRandomTimeSeed’:
i_system.c:105:19: error: storage size of ‘tz’ isn’t known
105 | struct timezone tz;
| ^~
```
Signed-off-by: Thomas Perale <thomas.perale@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Thomas Perale
2eb72e7666