[conda] updated meta.yaml with preprocessing selectors

conda/meta.yaml

@@ -53,8 +53,8 @@ test:
     - {{ name }}
 
   commands:
-    - export LC_ALL=C.UTF-8
-    - export LANG=C.UTF-8
+    - export LC_ALL=C.UTF-8  # [linux]
+    - export LANG=C.UTF-8  # [linux]
     - beat editor --help
     - nosetests --with-coverage --cover-package={{ name }} -sv {{ name }}
     - sphinx-build -aEW {{ project_dir }}/doc {{ project_dir }}/sphinx