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b237266640
Some applications might activate -Werror=format-nonliteral when building
their application. This breaks fortify headers build. Tell GCC to ignore
such warnings for this code.
This fixes the libubox and ucode build:
```
/include/fortify/stdio.h: In function 'snprintf':
/include/fortify/stdio.h:101:9: error: format not a string literal, argument types not checked [-Werror=format-nonliteral]
101 | return __orig_snprintf(__s, __n, __f, __builtin_va_arg_pack());
| ^~~~~~
/include/fortify/stdio.h: In function 'sprintf':
/include/fortify/stdio.h:110:17: error: format not a string literal, argument types not checked [-Werror=format-nonliteral]
110 | __r = __orig_snprintf(__s, __b, __f, __builtin_va_arg_pack());
| ^~~
/include/fortify/stdio.h:114:17: error: format not a string literal, argument types not checked [-Werror=format-nonliteral]
114 | __r = __orig_sprintf(__s, __f, __builtin_va_arg_pack());
| ^~~
cc1: all warnings being treated as errors
ninja: build stopped: subcommand failed.
```
Link: https://github.com/openwrt/openwrt/pull/22042
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>