cmd/cgo: explicitly use void for functions with no parameters

[mauri870]

Currently, exported Go functions with no parameters generate C functions
with an empty parameter list. In C, a function with an empty parameter
list can accept any number of arguments, whereas a function with a single
void parameter explicitly declares that it takes no arguments.

To align the generated C functions with their Go prototypes, update the
code generation to explicitly include a void parameter for functions
with no parameters.

Fixes #68411

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Tryjob golang/try/gotip-windows-amd64 has failed with summary (view all results):

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• go on master (change 638635)

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To reproduce, try gomote repro 8727668705758681185.

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• Output for go tool dist test -json [shard 1]

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