qtmultimedia: mingw-w64 6 compatibility

src/qtmultimedia-1-fixes.patch

@@ -0,0 +1,30 @@
+This file is part of MXE. See LICENSE.md for licensing information.
+
+Contains ad hoc patches for cross building.
+
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Mark Brand <mabrand@mabrand.nl>
+Date: Mon, 17 Sep 2018 12:38:35 +0200
+Subject: [PATCH 1/1] mingw-w64 6 fix
+
+
+diff --git a/src/plugins/common/evr/evrdefs.h b/src/plugins/common/evr/evrdefs.h
+index 1111111..2222222 100644
+--- a/src/plugins/common/evr/evrdefs.h
++++ b/src/plugins/common/evr/evrdefs.h
+@@ -83,6 +83,7 @@ HRESULT WINAPI Direct3DCreate9Ex(UINT SDKVersion, IDirect3D9Ex**);
+ #define MF_E_TRANSFORM_NEED_MORE_INPUT ((HRESULT)0xC00D6D72L)
+ #endif
+ 
++#if __MINGW64_VERSION_MAJOR < 6
+ #ifdef __GNUC__
+ typedef struct MFVideoNormalizedRect {
+     float left;
+@@ -91,6 +92,7 @@ typedef struct MFVideoNormalizedRect {
+     float bottom;
+ } MFVideoNormalizedRect;
+ #endif
++#endif
+ 
+ #include <initguid.h>
+ 

src/qtmultimedia.mk

@@ -16,7 +16,9 @@ define $(PKG)_UPDATE
 endef
 
 define $(PKG)_BUILD
-    cd '$(1)' && '$(PREFIX)/$(TARGET)/qt5/bin/qmake'
+    cd '$(1)' && '$(PREFIX)/$(TARGET)/qt5/bin/qmake' \
+        -after \
+        'LIBS_PRIVATE += -lamstrmid'
     $(MAKE) -C '$(1)' -j '$(JOBS)'
     $(MAKE) -C '$(1)' -j 1 install
 endef