build: get ninja for TravisCI from xenial-backports
Meson 0.54.0 requires ninja >= 1.7:
https://mesonbuild.com/Release-notes-for-0-54-0.html#ninja-version-requirement-bumped-to-17
Get ninja-1.7.1 from xenial backports.
build: get ninja for TravisCI from xenial-backports Tags None Subscribers None
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