Build bitcoin-qt-base library using cmake.
Build bitcoin-qt-base library using cmake.

Summary: As per title.

Test Plan:
  ninja bitcoin-qt-base

Reviewers: #bitcoin_abc, jasonbcox

Reviewed By: #bitcoin_abc, jasonbcox

Subscribers: teamcity

Differential Revision: https://reviews.bitcoinabc.org/D1087

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