[PATCH] if_ole build error with mingw64-i686 under cygwin

[Guopeng Wen]

I just found that I can build Windows native executable with cygwin
(again) using new mingw64-i686-* packages.  Those packages are used
for win32 target development.

When I try to build I found the following error:
    In file included from if_ole.cpp:44:0:
    if_ole.h:49:54: error: declaration of C function
    ‘void* MIDL_user_allocate(size_t)’ conflicts with
    /usr/i686-w64-mingw32/sys-root/mingw/include/rpcndr.h:97:20: error:
    previous declaration ‘void* MIDL_user_allocate(SIZE_T)’ here

Here's the command line I used to build Vim GUI under cygwin:
    cd src && \
    make GUI=yes OLE=yes ARCH=i686 WINVER=0x0500 NETBEANS=no \
    CROSS_COMPILE=/usr/bin/i686-w64-mingw32- STATIC_STDCPLUS=yes \
    -f Make_ming.mak

The error can be easily fixed with the attached patch (conditional
compilation for prototypes).  I've verified that patch with the
following build environment:
- MinGW
- mingw64-i686 under cygwin
- Visual Studio 2010

-- 
Guopeng

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if_ole.patch
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