src: use __FUNCSIG__ on Windows in backtrace
To show function signature if possible.
Refs: https://github.com/nodejs/node/pull/50242#discussion_r1612915226 Refs: https://learn.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=msvc-170
I am not sure if this actually works since I don't have a Windows device right now. TBD how to test this in the CI...