Update bundled zlib to version 1.2.11

Also clean up some unused files.
The remaining diff to clean 1.2.11 is archived in the qtpatches.diff file.

[ChangeLog][Third-Party Code] zlib was updated to version 1.2.11.

Task-number: QTBUG-31020
Change-Id: I89f890904af48c6e9ba6eabc5d58f5adbe2c53f0
Reviewed-by: Kai Koehne <kai.koehne@qt.io>

1 files changed, 25 insertions, 0 deletions

diff --git a/src/3rdparty/zlib/src/gzclose.c b/src/3rdparty/zlib/src/gzclose.c
new file mode 100644
index 0000000000..caeb99a317
--- /dev/null
+++ b/src/3rdparty/zlib/src/gzclose.c
@@ -0,0 +1,25 @@
+/* gzclose.c -- zlib gzclose() function
+ * Copyright (C) 2004, 2010 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "gzguts.h"
+
+/* gzclose() is in a separate file so that it is linked in only if it is used.
+   That way the other gzclose functions can be used instead to avoid linking in
+   unneeded compression or decompression routines. */
+int ZEXPORT gzclose(file)
+    gzFile file;
+{
+#ifndef NO_GZCOMPRESS
+    gz_statep state;
+
+    if (file == NULL)
+        return Z_STREAM_ERROR;
+    state = (gz_statep)file;
+
+    return state->mode == GZ_READ ? gzclose_r(file) : gzclose_w(file);
+#else
+    return gzclose_r(file);
+#endif
+}