sys: Add imhex/lib path to plugin libraries search paths

lib/libimhex/include/hex/helpers/fs.hpp

@@ -101,6 +101,7 @@ namespace hex::fs {
         Scripts,
         Inspectors,
         Themes,
+        Libraries,
 
         END
     };

lib/libimhex/source/helpers/fs.cpp

@@ -226,6 +226,9 @@ namespace hex::fs {
             case ImHexPath::Plugins:
                 result = appendPath(getPluginPaths(), "plugins");
                 break;
+            case ImHexPath::Libraries:
+                result = appendPath(getPluginPaths(), "lib");
+                break;
             case ImHexPath::Resources:
                 result = appendPath(getDataPaths(), "resources");
                 break;