Add GCC support for compiling with hidden visibility #89
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GCC hidden visibility closely mimics the Windows DLL import/export
feature, which cleans up the symbol export table and leads to faster
startup times as well as a more stable ABI.
This PR has no immediate effect until GCC is instructed to hide symbols
with -fvisibility=hidden -fvisibility-inlines-hidden. I did not enable
this yet because unlike MSVC, GCC does not export type info and vtables
by default, so this PR depends on #88 to work.
Signed-off-by: Timo Röhling timo@gaussglocke.de