main/mapbox-gl-native: upgrade to 1.6.0
Fix previous version not building anymore, as seen on v21.03 branch: https://builds.sr.ht/~postmarketos/job/433826
Just submitting @PureTryOut's work as MR. Shall be backported to v21.03 after merge.
I've bumped the pkgrels of mapbox-gl-qml and pure-maps, I guess they would break otherwise.
The resulting pure-maps build should be tested before merging this.
EDIT: pure-maps and its two depends are the last blockers for the initial build of v21.03 for x86_64. I've temporarily removed these three packages for now, let's rever the commit that removed them and cherry pick the MR once it's in master to get it back.
Edited by Oliver Smith