darwin: fix also .so names in darwin

Darwin does not actually require `*.dylib` extension, and some ports of
unix software may still simply compile and install these as `*.so` files.

Include `*.so` in the find in this case.

Co-authored-by: Artturi <[e-mail]>
Co-authored-by: toonn <[e-mail]>

pkgs/build-support/setup-hooks/fix-darwin-dylib-names.sh

···
 
 fixDarwinDylibNamesIn() {
     local dir="$1"
-    fixDarwinDylibNames $(find "$dir" -name "*.dylib")
+    fixDarwinDylibNames $(find "$dir" -name "*.dylib" -o -name "*.so" -o -name "*.so.*")
 }