i#4501: Undo some changes to loader_shared.c made by 9293e7ae7. #6951
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The purpose of 9293e7a was to add TLS support for Windows, but it broke the use of multiple clients. This patch brings back the previous code for non-Windows, so on Unix all the loading happens later, in loader_init_epilogue().
Also add a test of two clients.
Unfortunately this patch undoes the unification of the Unix and Windows loaders that happened with 9293e7a. It would be good to find a way of unifying the Unix and Windows loaders that does not break the use of multiple clients (#6963).