Previously, any DLL which links any function from libglapi-static would
end up exporting the entire GL API surface area, due to the dllexport
introduced by BUILD_GL32. This fix allows DLLs to internally include
definitions of gl* APIs without having to export the entire surface.
Also, remove unreachable with_shared_glapi branch already in an else block.
Reviewed By: Bill Kristiansen <billkris@microsoft.com>
Reviewed-by: Charmaine Lee >charmainel@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12677>