Get wrap from wrapdb when not found locally
Get wrap from wrapdb when not found locally

Download wrap file from wrapdb automatically when it is not found
locally but we have it in wrapdb.json.

This makes for example `dependency('glib-2.0')` work out of the box
simply by running `meson wrap update-db`, even if the project does not
provide any wraps.

mesonbuild/meson,pexip/meson,pexip/meson,mesonbuild/meson,pexip/meson,mesonbuild/meson,pexip/meson,pexip/meson,pexip/meson,mesonbuild/meson,pexip/meson,mesonbuild/meson,mesonbuild/meson,pexip/meson,pexip/meson,pexip/meson,mesonbuild/meson,mesonbuild/meson,mesonbuild/meson,mesonbuild/meson