[libmicrohttpd] visibility

[LRN]

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Recently MHD added visibility attributes to hide some functions.

This throws lots of warnings on W32, since visibility attributes are
not supported here.

I knew for a fact that GTK does have visibility, and doesn't have
visibility problems on W32, so i checked how the do this. Turns out,
the compile with -fvisibility=hidden (which doesn't throw any warnings
on W32, it's ignored), and mark _visible_ functions with "attribute
visibility default" AND (on W32) __dllexport. Obviously, this is when
compiling GTK. For GTK users the macro that puts these on functions
expands to a simple "extern".

I'll try to implement this for MHD and see how it goes.

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