depends: Purge libtool archives
Summary:
We use pkg-config where we can, which generally replaces libtool at a higher level and does not have the same downsides as libtool. These archives sit in our depends tree with no purpose and pollute the final bitcoin build with massive overlinking. See here for an explanation of the various problems libtool archives can cause: https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Handling_Libtool_Archives
Backport of core PR15844.
This does actually more that described, as it includes PR16041 (it was
merged as 1 PR instead of 2).
Test Plan: Run the Gitian builds.
Reviewers: #bitcoin_abc, deadalnix
Reviewed By: #bitcoin_abc, deadalnix
Differential Revision: https://reviews.bitcoinabc.org/D5621