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

tools/v8_gypfiles/toolchain.gypi

@@ -138,7 +138,7 @@
         'cflags': [ '-Werror', '-Wno-unknown-pragmas' ],
       },{
         'cflags!': [ '-Wall', '-Wextra' ],
-        'cflags': [ '-Wno-return-type', '-Wno-int-in-bool-context' ],
+        'cflags': [ '-Wno-return-type' ],
       }],
       ['v8_target_arch=="arm"', {
         'defines': [