Only export defined symbols.  Note that I couldn't find any difference between object code generated without the flag but it makes sense and might make a difference in the future.
Only export defined symbols.  Note that I couldn't find any difference
between object code generated without the flag but it makes sense and might
make a difference in the future.

PR:		kern/53008
Submitted by:	Jens Rehsack rehsack at liwing de

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