Fix some warnings

src/celestia/win32/winmain.cpp

@@ -1876,7 +1876,7 @@ bool SetDCPixelFormat(HDC hDC)
             PFD_SUPPORT_OPENGL |    // Support OpenGL calls in window
             PFD_DOUBLEBUFFER,        // Double buffered mode
             PFD_TYPE_RGBA,        // RGBA Color mode
-            GetDeviceCaps(hDC, BITSPIXEL),// Want the display bit depth
+            (BYTE)GetDeviceCaps(hDC, BITSPIXEL),// Want the display bit depth
             0,0,0,0,0,0,          // Not used to select mode
             0,0,            // Not used to select mode
             0,0,0,0,0,            // Not used to select mode

src/tools/cmod/cmodfix/cmodfix.cpp

@@ -1031,6 +1031,8 @@ generateTangents(Mesh& mesh,
                 }
             }
             break;
+        default:
+            break;
         }
     }