#2324 Scintilla arm64 Windows build fails

[mberchtold]

The ARM64 build fails with on Windows (MSVC):
LINK : fatal error LNK1246: '/CETCOMPAT' not compatible with 'ARM64' target machine; link without '/CETCOMPAT'

The problem is that the
<cetcompat>true</cetcompat>
option is available for all platforms.

The attached patch takes care of this.

[mberchtold]

I meant "option is NOT available for all platforms.", specifically arm64.

[Neil Hodgson]

Committed as [bcc29f].