[PATCH] build: look for libnl.sym in build dir, not src dir

[Nicolas CARRIER]

When the build dir isn't the source dir, the libnl.sym file is searched in the 
source dir while being generated in the build dir.

This problem problem affects the current HEAD and at least the libnl3_2_23 
stable release.

PS: and sorry for the double posting concerning my rtnl_addr_get_link question...
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