Fix two minor warnings found by clang

NSString stringWithContentsOfFile without explicit encoding is deprecated
since OS X 10.4


Index: macosx/AboutWindowController.m
===================================================================
--- macosx/AboutWindowController.m	(revision 8389)
+++ macosx/AboutWindowController.m	(working copy)
@@ -71,7 +71,9 @@

 - (IBAction) showLicense: (id) sender
 {
-    [fLicenseView setString: [NSString stringWithContentsOfFile: [[NSBundle mainBundle] pathForResource: @"COPYING" ofType: nil]]];
+    [fLicenseView setString: [NSString stringWithContentsOfFile:
+                              [[NSBundle mainBundle] pathForResource: @"COPYING" ofType: nil]
+                              encoding: NSUTF8StringEncoding error: nil]];
     [fLicenseCloseButton setTitle: NSLocalizedString(@"OK", "About window -> license close button")];

 	[NSApp beginSheet: fLicenseSheet modalForWindow: [self window] modalDelegate: nil didEndSelector: nil contextInfo: nil];
Index: macosx/PortChecker.m
===================================================================
--- macosx/PortChecker.m	(revision 8389)
+++ macosx/PortChecker.m	(working copy)
@@ -108,7 +108,7 @@
             [self callBackWithStatus: PORT_STATUS_CLOSED];
         else
         {
-            NSLog([NSString stringWithFormat: @"Unable to get port status: invalid response (%@)", probeString]);
+            NSLog(@"Unable to get port status: invalid response (%@)", probeString);
             [self callBackWithStatus: PORT_STATUS_ERROR];
         }
         [probeString release];