qgis3: incorrect variants

[mojca (Mojca Miklavec)]

The code for variants is not working correctly, it makes just one conflicting variant with space.

$ port lint
--->  Verifying Portfile for qgis3
Warning: Variant postgresql10 conflicts with non-existing variant postgresql95 postgresql96
Warning: Variant postgresql95 conflicts with non-existing variant postgresql10 postgresql96
Warning: Variant postgresql96 conflicts with non-existing variant postgresql10 postgresql95
Warning: Variant python34 conflicts with non-existing variant python35 python36
Warning: Variant python35 conflicts with non-existing variant python34 python36
Warning: Variant python36 conflicts with non-existing variant python34 python35
--->  0 errors and 6 warnings found.

$ port info qgis3 +postgresql96 +postgresql95
qgis3 @3.0.0_1 (gis)
Variants:             debug, grass, postgresql10, +postgresql95, +postgresql96, python34, python35, [+]python36

[ryandesign (Ryan Carsten Schmidt)]

In 8726435f4a45f8f4ca483e3b33aceb62a48ceb18/macports-ports:

qgis3: fix variant generation

Closes: #56103

[mojca (Mojca Miklavec)]

Thank you