fixup! mingw: Embed a manifest to trick UAC into Doing The Right Thing

Also mark the Git executable as compatible with Windows Vista or later
(at the time of writing, the latest version is Windows 10) because
otherwise the manifest would be ignored on Windows 8.1 or later.

This fixes git-for-windows#258.

In Git for Windows 2.x' context, we technically do not need to embed the
<compatibility> section ourselves because MSys2's
mingw-w64-<arch>-windows-default-manifest package already contains it,
starting with version 6.4-2 (release on or after July 10th, 2015).
However, not all Git developers use MSys2 on Windows (doubtlessly in an
attempt to make the life of Git for Windows' maintainer harder than
necessary), therefore we still need to add that section explicitly.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

compat/win32/git.manifest

@@ -8,4 +8,18 @@
                         </requestedPrivileges>
                 </security>
         </trustInfo>
+	<compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+		<application>
+			<!-- Windows Vista -->
+			<supportedOS Id="{e2011457-1546-43c5-a5fe-008deee3d3f0}"/>
+			<!-- Windows 7 -->
+			<supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/>
+			<!-- Windows 8 -->
+			<supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>
+			<!-- Windows 8.1 -->
+			<supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/>
+			<!-- Windows 10 -->
+			<supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
+		</application>
+	</compatibility>
 </assembly>