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.

thirdparty/README.md

@@ -599,13 +599,16 @@ comments and a patch is provided in the squish/ folder.
 ## tinyexr
 
 - Upstream: https://github.com/syoyo/tinyexr
-- Version: 1.0.0 (e4b7840d9448b7d57a88384ce26143004f3c0c71, 2020)
+- Version: 1.0.1 (67010eae802211202d0797f4df2b809f4ba7442c, 2021)
 - License: BSD-3-Clause
 
 Files extracted from upstream source:
 
 - `tinyexr.{cc,h}`
 
+The `tinyexr.cc` file was modified to include `zlib.h` which we provide,
+instead of `miniz.h` as an external dependency.
+
 
 ## vhacd
 

thirdparty/tinyexr/tinyexr.cc

@@ -4,5 +4,9 @@
 #endif
 #endif
 
+// -- GODOT start --
+#include <zlib.h> // Should come before including tinyexr.
+// -- GODOT end --
+
 #define TINYEXR_IMPLEMENTATION
 #include "tinyexr.h"