Use lower-case windows.h for compat with MinGW
diff --git a/Source/astcenc_platform_isa_detection.cpp b/Source/astcenc_platform_isa_detection.cpp
index 4158da3..8ed9843 100644
--- a/Source/astcenc_platform_isa_detection.cpp
+++ b/Source/astcenc_platform_isa_detection.cpp
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: Apache-2.0
// ----------------------------------------------------------------------------
-// Copyright 2020-2021 Arm Limited
+// Copyright 2020-2022 Arm Limited
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
@@ -47,7 +47,7 @@
============================================================================ */
#if !defined(__clang__) && defined(_MSC_VER)
#define WIN32_LEAN_AND_MEAN
-#include <Windows.h>
+#include <windows.h>
#include <intrin.h>
/**
diff --git a/Source/astcenccli_platform_dependents.cpp b/Source/astcenccli_platform_dependents.cpp
index 11bceba..cfcdfeb 100644
--- a/Source/astcenccli_platform_dependents.cpp
+++ b/Source/astcenccli_platform_dependents.cpp
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: Apache-2.0
// ----------------------------------------------------------------------------
-// Copyright 2011-2021 Arm Limited
+// Copyright 2011-2022 Arm Limited
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
@@ -38,7 +38,7 @@
#if defined(_WIN32) && !defined(__CYGWIN__)
#define WIN32_LEAN_AND_MEAN
-#include <Windows.h>
+#include <windows.h>
/** @brief Alias pthread_t to one of the internal Windows types. */
typedef HANDLE pthread_t;
