runtime_loader: treat weak symbols as strong symbols definitions.

http://www.sourceware.org/ml/libc-hacker/2000-06/msg00029.html
Change-Id: I15bf1f48dda32942e2a93610d62dabe0cabdc9a1
Reviewed-on: htt

runtime_loader: treat weak symbols as strong symbols definitions.

http://www.sourceware.org/ml/libc-hacker/2000-06/msg00029.html
Change-Id: I15bf1f48dda32942e2a93610d62dabe0cabdc9a1
Reviewed-on: https://review.haiku-os.org/c/1191
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

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