src: fix ignore GCC -Wcast-function-type for older compilers
Fixes: https://github.com/nodejs/node/issues/31517
I don't have an easy access to pre-8 GCC compiler so I haven't explicitly tested this. Perhaps @mscdex can check if this fixes your issue?
GCC8 changelog https://gcc.gnu.org/gcc-8/changes.html which denotes the addition of Wcast-function-type
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Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
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