qga/vss-win32: check old VSS SDK headers

The VssCoordinator & VssAdmin interfaces have been moved to vsadmin.h in
the Windows SDK.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20220222194008.610377-3-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

meson.build

@@ -1954,12 +1954,15 @@ config_host_data.set('CONFIG_AF_VSOCK', cc.compiles(gnu_source_prefix + '''
   }'''))
 
 have_vss = false
+have_vss_sdk = false # old xp/2003 SDK
 if targetos == 'windows' and link_language == 'cpp'
   have_vss = cxx.compiles('''
     #define __MIDL_user_allocate_free_DEFINED__
     #include <vss.h>
     int main(void) { return VSS_CTX_BACKUP; }''')
+  have_vss_sdk = cxx.has_header('vscoordint.h')
 endif
+config_host_data.set('HAVE_VSS_SDK', have_vss_sdk)
 
 have_ntddscsi = false
 if targetos == 'windows'

qga/vss-win32/install.cpp

@@ -13,7 +13,11 @@
 #include "qemu/osdep.h"
 
 #include "vss-common.h"
+#ifdef HAVE_VSS_SDK
 #include <vscoordint.h>
+#else
+#include <vsadmin.h>
+#endif
 #include "install.h"
 #include <wbemidl.h>
 #include <comdef.h>

qga/vss-win32/provider.cpp

@@ -12,7 +12,11 @@
 
 #include "qemu/osdep.h"
 #include "vss-common.h"
+#ifdef HAVE_VSS_SDK
 #include <vscoordint.h>
+#else
+#include <vsadmin.h>
+#endif
 #include <vsprov.h>
 
 #define VSS_TIMEOUT_MSEC (60*1000)

qga/vss-win32/vss-common.h

@@ -64,12 +64,13 @@ const CLSID CLSID_QGAVSSProvider = { 0x6e6a3492, 0x8d4d, 0x440c,
 const TCHAR g_szClsid[] = TEXT("{6E6A3492-8D4D-440C-9619-5E5D0CC31CA8}");
 const TCHAR g_szProgid[] = TEXT("QGAVSSProvider");
 
+#ifdef HAVE_VSS_SDK
 /* Enums undefined in VSS SDK 7.2 but defined in newer Windows SDK */
 enum __VSS_VOLUME_SNAPSHOT_ATTRIBUTES {
     VSS_VOLSNAP_ATTR_NO_AUTORECOVERY       = 0x00000002,
     VSS_VOLSNAP_ATTR_TXF_RECOVERY          = 0x02000000
 };
-
+#endif
 
 /* COM pointer utility; call ->Release() when it goes out of scope */
 template <class T>