#102 WinMain without return statement

[Andrea Mazzoleni]

The WinMain function in the file src/win/zloaderw.c
doesn't return a value as expected. It must terminate
with something like "return 0;".

Without the return statement, the exit process status
get a random value. This is problem for frontends which
check this value because they recognize ZSNES always
terminating with an error.

[Nach M. S.]

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Fixed.
And keep up the good work on your advanced projects.