raise minimum required mingw64 version from 5.0 to 6.0

DirectX 12 sdk provided by MinGW 8.0.1 is required for Qt 6,
and patching MinGW 5.0 to include d3d12 sdk requires sheer
amount of effort.

bin/winvlc.c

@@ -106,11 +106,7 @@ static void PrioritizeSystem32(void)
 #endif
     PROCESS_MITIGATION_IMAGE_LOAD_POLICY m = { .Flags = 0 };
     m.PreferSystem32Images = 1;
-#if defined(__MINGW64_VERSION_MAJOR) && __MINGW64_VERSION_MAJOR < 6
-    SetProcessMitigationPolicy( (PROCESS_MITIGATION_POLICY)10, &m, sizeof( m ) );
-#else
     SetProcessMitigationPolicy( ProcessImageLoadPolicy, &m, sizeof( m ) );
-#endif
 }
 
 static void vlc_kill(void *data)

configure.ac

@@ -663,7 +663,7 @@ dnl Check for broken versions of mingw-runtime compatability library
     AC_PREPROC_IFELSE([AC_LANG_SOURCE([
 #include <_mingw.h>
 #if defined(__MINGW64_VERSION_MAJOR)
-# if __MINGW64_VERSION_MAJOR < 5
+# if __MINGW64_VERSION_MAJOR < 6
 #  error Update your mingw-w64! This one is too old.
 # endif
 #else
@@ -673,7 +673,7 @@ dnl Check for broken versions of mingw-runtime compatability library
         AC_MSG_RESULT([ok])
     ], [
         AC_MSG_RESULT([present])
-        AC_MSG_ERROR([LibVLC requires Mingw-w64 version 5.0 or higher!])
+        AC_MSG_ERROR([LibVLC requires Mingw-w64 version 6.0 or higher!])
     ])
 
     AS_IF([test "${win_ucrt_build}" = "no"], [
@@ -1176,9 +1176,6 @@ AS_IF([test "${SYS}" = "mingw32"], [
   AC_MSG_CHECKING(for if_nametoindex availability)
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
       [[#include <windows.h>
-        #if defined(__MINGW64_VERSION_MAJOR) && __MINGW64_VERSION_MAJOR < 6
-        # include <wincrypt.h>
-        #endif
         #include <iphlpapi.h>
         static void test (void) {
           if_nametoindex("");

meson.build

@@ -359,12 +359,12 @@ windows_version_test = '''
             prefix: '#include <_mingw.h>')
 
         if mingw_version_major == ''
-            error('Cannot compile with MinGW, use MinGW-w64 >= 5.0 instead.')
+            error('Cannot compile with MinGW, use MinGW-w64 >= 6.0 instead.')
         endif
 
-        # Check that MinGW w64 is at least 5.0
-        if mingw_version_major.to_int() < 5
-            error('MinGW-w64 5.0 or higher required!')
+        # Check that MinGW w64 is at least 6.0
+        if mingw_version_major.to_int() < 6
+            error('MinGW-w64 6.0 or higher required!')
         endif
 
         have_mingw = true

src/network/udp.c

@@ -38,9 +38,6 @@
 #include <vlc_network.h>
 
 #ifdef _WIN32
-#   if defined(__MINGW64_VERSION_MAJOR) && __MINGW64_VERSION_MAJOR < 6
-#    include <wincrypt.h>
-#   endif
 #   include <iphlpapi.h>
 #else
 #   include <unistd.h>