macOS: Revert default Hi-DPI support in applications

This reverts commit v3.9.0-rc1~287^2 (macOS: Enable Hi-DPI support in
applications by default, 2017-04-08).  It breaks iOS applications that
do not use their own `MACOSX_BUNDLE_INFO_PLIST` because `NSApplication`
is only for macOS apps.  Until more complete support for iOS is added
to CMake (e.g. with a different default plist file) we must allow
our default plist file to work for both macOS and iOS.

Fixes: #17179

Help/release/3.9.rst

@@ -310,9 +310,6 @@ Other Changes
   in dependent targets may now compile without waiting for their targets'
   dependencies to link.
 
-* On macOS, the default application bundle ``Info.plist`` file now enables
-  Hi-DPI support.
-
 * On macOS, ``RPATH`` settings such as :prop_tgt:`BUILD_WITH_INSTALL_RPATH`
   no longer affect the ``install_name`` field.  See policy :policy:`CMP0068`.
 
@@ -333,3 +330,10 @@ Changes made since CMake 3.9.0 include the following.
   CMake 3.9.0 has been removed for the 3.9 series due to regressions
   caused by new use of ``<PackageName>_ROOT`` variables.  The behavior
   may be re-introduced in the future in a more-compatible way.
+
+3.9.2
+-----
+
+* On macOS, the default application bundle ``Info.plist`` file no longer
+  enables Hi-DPI support as it did in 3.9.0 and 3.9.1.  The change had
+  to be reverted because it broke iOS applications.

Modules/MacOSXBundleInfo.plist.in

@@ -30,9 +30,5 @@
 	<true/>
 	<key>NSHumanReadableCopyright</key>
 	<string>${MACOSX_BUNDLE_COPYRIGHT}</string>
-	<key>NSPrincipalClass</key>
-	<string>NSApplication</string>
-	<key>NSHighResolutionCapable</key>
-	<string>True</string>
 </dict>
 </plist>