tinyexr: Sync with upstream 1.0.1

Removes miniz as a bundled dependency, relies on our own zlib instead.

Includes a couple commits ahead of `v1.0.1` tag to fix MinGW builds.

(cherry picked from commit 46d3effa99)

modules/tinyexr/image_saver_tinyexr.cpp

@@ -31,6 +31,8 @@
 #include "image_saver_tinyexr.h"
 #include "core/math/math_funcs.h"
 
+#include <zlib.h> // Should come before including tinyexr.
+
 #include "thirdparty/tinyexr/tinyexr.h"
 
 #include <cstdlib>