Use only "error" and "ifaces" feature for util package

[chertov]

fix some problems with util Vnet mod compilation on armv5te platforms
webrtc-rs/util#6

[codecov]

Codecov Report

Merging #17 (991a20b) into main (7be4dda) will not change coverage.
The diff coverage is n/a.

❗ Current head 991a20b differs from pull request most recent head 2eb2ac2. Consider uploading reports for the commit 2eb2ac2 to get more accurate results

@@           Coverage Diff           @@
##             main      #17   +/-   ##
=======================================
  Coverage   62.14%   62.14%           
=======================================
  Files          24       24           
  Lines        2100     2100           
  Branches      534      535    +1     
=======================================
  Hits         1305     1305           
  Misses        393      393           
  Partials      402      402           

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