[GR-67249] Remove "javac.lint.overrides": "none" as it prevents failing with mx build --warning-as-error

Author: eregon

mx.graalpython/suite.py

@@ -405,8 +405,6 @@
             "forceJavac": True, # GRAALPYTHON_PROCESSOR is not compatible with ECJ
             "workingSets": "Truffle,Python",
             "spotbugsIgnoresGenerated": True,
-            # GR-60063: this disables all javac warnings
-            "javac.lint.overrides" : "none",
         },
 
         # GRAALPYTHON_UNIT_TESTS