Fix main() detection in mangling script

ghidra/ghidra_scripts/MSVC7Mangle.java

@@ -141,7 +141,7 @@ public class MSVC7Mangle extends GhidraScript {
 		// main() and extern "C" symbols get C name mangling
 		// (some other things, do, too, but just use extern "C" instead
 		// of making me find and list them all...)
-		return nameRaw == "main" ||
+		return nameRaw.equals("main") ||
 		       nameRaw.startsWith("extern_\"C\"::") ? mangleCFn  (f)
 		                                            : mangleCppFn(f);
 	}