[Bug algol68/122330] algol68/compile/error-coercion-2.a68 FAILs with -D_FORTIFY_SOURCE=3

[pietro at sociotechnical dot xyz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122330

--- Comment #3 from pietro <pietro at sociotechnical dot xyz> ---
Changing all sprintf's in a68_mode_error_text to use SNPRINTF_SIZE - txt fixes
all tests when building the compiler with -D_FORTIFY_SOURCE=3.

Patch at
https://inbox.sourceware.org/algol68/20251025033345.757826-1-pietro@sociotechnical.xyz/T/#u