[libvpx] Update to v1.12.0

libs/libvpx/vpx_ports/static_assert.h

@@ -0,0 +1,30 @@
+/*
+ *  Copyright (c) 2020 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef VPX_VPX_PORTS_STATIC_ASSERT_H_
+#define VPX_VPX_PORTS_STATIC_ASSERT_H_
+
+#if defined(_MSC_VER)
+#define VPX_STATIC_ASSERT(boolexp)              \
+  do {                                          \
+    char vpx_static_assert[(boolexp) ? 1 : -1]; \
+    (void)vpx_static_assert;                    \
+  } while (0)
+#else  // !_MSC_VER
+#define VPX_STATIC_ASSERT(boolexp)                         \
+  do {                                                     \
+    struct {                                               \
+      unsigned int vpx_static_assert : (boolexp) ? 1 : -1; \
+    } vpx_static_assert;                                   \
+    (void)vpx_static_assert;                               \
+  } while (0)
+#endif  // _MSC_VER
+
+#endif  // VPX_VPX_PORTS_STATIC_ASSERT_H_