Bartłomiej Piotrowski authored Dec 05, 2014 and Natanael Copa committed Dec 29, 2014

Libtool archives are useless in the most of cases and can be safely
removed. A quick grep shows that *.la files are explicitly removed in
903 APKBUILDs, while intentionally preserved only in 17.

postcheck() is discussable place to perform the deletion, but it's
currently the only function being run for each subpackage, including
the artifact of package().