Add run_exports pinning for libwloc

See discussion in bioconda/bioconda-recipes#13523 (comment) 

`max_pin='x.x'` should hopefully do it - it is a bit aggressive for `1.x` series as version `1.11.9` has `libhwloc.so.5` (consistent since perhaps `1.4`) - meanwhile `2.0.2` is already at `libhwloc.so.15` so better play safe.

BTW, this recipe might need a folder split for [1.11](https://www.open-mpi.org/software/hwloc/v1.11/) (now "ultra-stable") and [2.0](https://www.open-mpi.org/software/hwloc/v2.0/) to add the later versions `1.11.10`, `1.11.11` and/or `1.11.12` as well as `2.0.3` hinted at in conda-forge#17.

As libwloc

recipe/meta.yaml

@@ -20,6 +20,8 @@ source:
 build:
   number: 1000
   skip: True  # [win and vc<14]
+  run_exports:
+  - {{ pin_subpackage(name, max_pin='x.x') }}  
 
 requirements:
   build: