[lldb] Remove duplicated lldbsuite method (NFC) (#8111)

Author: kastiglione

lldb/packages/Python/lldbsuite/test/builders/builder.py

@@ -175,11 +175,6 @@ def getLLDBSwiftLibs(self):
             return ["SWIFT_LIBS_DIR={}".format(configuration.swift_libs_dir)]
         return []
 
-    def getLLDBSwiftLibs(self):
-        if configuration.swift_libs_dir:
-            return ["SWIFT_LIBS_DIR={}".format(configuration.swift_libs_dir)]
-        return []
-
     def _getDebugInfoArgs(self, debug_info):
         if debug_info is None:
             return []