php 7.4.14 fails to build on aarch64 due to test suite failures.

Reverting back to php 7.4.13 by reverting commit
d033540e6c113323089403a26e39f9a288c9c857 works fine for me, though
obviously it would be better to track down the exact test suite failure
and figure out a proper fix.

This blocks numerous other packages from building, such as libsoup,
which blocks building of network-manager.


live well,
  vagrant