errno definition broken in non-threaded code

[Mike Frysinger]

so, would the correct fix here be:
 - if thread support is disabled, export errno symbols and do not define the 
location functions at all requiring all internal uClibc references to go 
through the GOT to get at the errno location
 - if thread support is enabled, do not export the errno symbols and allow 
internal hidden references to it from the location functions

so the implied question i guess is, how much ABI compat do we care about 
between threaded and none threaded builds ?
-mike
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