wcslib: fix darwin install name (#12868)

var/spack/repos/builtin/packages/wcslib/package.py

@@ -47,3 +47,9 @@ def configure_args(self):
             args.append('--without-x')
 
         return args
+
+    @run_after('install')
+    def darwin_fix(self):
+        # The shared library is not installed correctly on Darwin; fix this
+        if self.spec.satisfies('platform=darwin'):
+            fix_darwin_install_name(self.prefix.lib)