[PULL 06/24] qga/commands-win32: Fix problem with redundant protype declaration

[Thomas Huth <thuth@redhat.com>]

When compiling QEMU with MSYS2 on Windows, there is currently the
following error:

../qga/commands-win32.c:62:24: error: redundant redeclaration of
 'CM_Get_DevNode_PropertyW' [-Werror=redundant-decls]
   62 | CMAPI CONFIGRET WINAPI CM_Get_DevNode_PropertyW(
      |                        ^~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../qga/commands-win32.c:26:
C:/tools/msys64/mingw64/x86_64-w64-mingw32/include/cfgmgr32.h:840:26: note:
 previous declaration of 'CM_Get_DevNode_PropertyW' was here
  840 |   CMAPI CONFIGRET WINAPI CM_Get_DevNode_PropertyW(DEVINST dnDevInst,
   const DEVPROPKEY *PropertyKey, DEVPROPTYPE *PropertyType, PBYTE PropertyBuffer,
   PULONG PropertyBufferSize, ULONG ulFlags);

Seems like this protype is sometimes available in the cfgmgr32.h
header, and sometimes not. Let's silence the compiler warning here
to let the build pass with -Werror, too.

Message-Id: <20200915114757.55635-1-thuth@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 qga/commands-win32.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 48d8bbe649..0c3c05484f 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -57,8 +57,10 @@ DEFINE_DEVPROPKEY(qga_DEVPKEY_Device_DriverDate, 0xa8b865dd, 0x2e3d,
 DEFINE_DEVPROPKEY(qga_DEVPKEY_Device_DriverVersion, 0xa8b865dd, 0x2e3d,
     0x4094, 0xad, 0x97, 0xe5, 0x93, 0xa7, 0xc, 0x75, 0xd6, 3);
     /* DEVPROP_TYPE_STRING */
-/* The following shoud be in cfgmgr32.h, but it isn't */
+/* The CM_Get_DevNode_PropertyW prototype is only sometimes in cfgmgr32.h */
 #ifndef CM_Get_DevNode_Property
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wredundant-decls"
 CMAPI CONFIGRET WINAPI CM_Get_DevNode_PropertyW(
     DEVINST          dnDevInst,
     CONST DEVPROPKEY * PropertyKey,
@@ -68,6 +70,7 @@ CMAPI CONFIGRET WINAPI CM_Get_DevNode_PropertyW(
     ULONG            ulFlags
 );
 #define CM_Get_DevNode_Property CM_Get_DevNode_PropertyW
+#pragma GCC diagnostic pop
 #endif
 
 #ifndef SHTDN_REASON_FLAG_PLANNED
-- 
2.18.2