COMP: External_wcslib: Fix config setting environment
COMP: External_wcslib: Fix config setting environment

Co-authored-by: Davide Punzo <98c575b51927dcb7788452ce15b3ef65cb489ad9@hotmail.it>

Punzo/SlicerAstro,Punzo/SlicerAstro,Punzo/SlicerAstro,Punzo/SlicerAstro