build: fix unknown warning option

warning: unknown warning option '-Wno-int-in-bool-context';
did you mean '-Wno-gnu-include-next'? [-Wunknown-warning-option]
1 warning generated.

The `-Wint-in-bool-context` diagnostic is not enabled by default,
so no additional option is needed.

PR-URL: #36629
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>

Author: RaisinTen