Issue #12016: my_fgets() now always clears errors before calling fgets(). Fix
the following case: sys.stdin.read() stopped with CTRL+d (end of file),
raw_input() interrupted by CTRL+c.
diff --git a/Parser/myreadline.c b/Parser/myreadline.c
index 34fb45c..07c1d44 100644
--- a/Parser/myreadline.c
+++ b/Parser/myreadline.c
@@ -44,6 +44,7 @@
         if (PyOS_InputHook != NULL)
             (void)(PyOS_InputHook)();
         errno = 0;
+        clearerr(fp);
         p = fgets(buf, len, fp);
         if (p != NULL)
             return 0; /* No error */