mlog: Catch OSError when closing pager

For some reasons, with msys2 it sometimes raises OSError instead of
BrokenPipeError.

Fixes: mesonbuild#12541

mesonbuild/mlog.py

@@ -190,7 +190,7 @@ def stop_pager(self) -> None:
             try:
                 self.log_pager.stdin.flush()
                 self.log_pager.stdin.close()
-            except BrokenPipeError:
+            except OSError:
                 pass
             self.log_pager.wait()
             self.log_pager = None