Ignore OSException along with IOException

Author: BCSharp

Src/IronPython.Modules/_warnings.cs

@@ -260,7 +260,7 @@ internal static void showwarning(CodeContext context, object message, PythonType
                         ((TextWriter)file).Write(text);
                     } // unrecognized file type - warning is lost
                 }
-            } catch (IOException) {
+            } catch (Exception ex) when (ex is IOException or OSException) {
                 // invalid file - warning is lost
             }
         }

Src/IronPython/Modules/_fileio.cs

@@ -305,10 +305,10 @@ public override void close(CodeContext/*!*/ context) {
 
                 try {
                     flush(context);
-                } catch (IOException) {
-                    // flushing can fail, esp. if the other half of a pipe is closed
-                    // ignore it because we're closing anyway
-                }
+                } catch (IOException) { /* ignore */ } catch (OSException) { /* ignore */ }
+                // flushing can fail, esp. if the other half of a pipe is closed
+                // ignore it because we're closing anyway
+
                 _closed = true;
 
                 if (_closefd) {