Allow disabling SetProcessDPIAware() call

Add Windows-specific wxMSWDisableSettingHighDPIAware() function then can
be called before startup (i.e. wxEntry() call) to disable wxWidgets'
handling of DPI awareness. This is useful for code embedded in non-wx
applications as well as for purely wx application that are not
HiDPI-ready (although the latter has the option of forcing
dpiAware=false in the manifest).

See also https://groups.google.com/d/msg/wx-dev/Z0VpgzCY34U/f1FfPqGDppMJ
and #16116.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@78406 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/init.h

@@ -107,5 +107,22 @@ bool wxInitialize(int argc = 0, wxChar **argv = NULL);
 */
 void wxUninitialize();
 
+/**
+    Prevents wxWidgets from setting HighDPI awareness mode.
+
+    wxEntry calls SetDPIProcessAware() early during initialization on Windows.
+    To prevent this (e.g. because wx is embedded in native code and disabling
+    DPI awareness in the manifest is not an option), call this function
+    *before* wxEntry() is called.
+
+    @onlyfor{wxmsw}
+
+    @header{wx/init.h}
+
+    @since 3.0.3, but only available in 3.0.x, not 3.1+ which doesn't make
+           the SetDPIProcessAware() call anymore.
+*/
+void wxMSWDisableSettingHighDPIAware();
+
 //@}