naddy d159f8d1ad Make use of "find -exec {} +" (which is POSIX) and "find -delete"
(which is not) throughout the ports Makefiles.

* Replace find|xargs with find -exec {} +
* Replace -exec {} \; with -exec {} + if applicable.
* Use the -delete operator to remove files and empty directories.
* Combine and tweak some find(1) invocations while here.

ok kn@ rsadowski@ espie@
2020-03-20 16:44:21 +00:00
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