Add wxVersionInfo and functions returning it for 3rd party libraries.

Add simple wxVersionInfo class holding the version information.

Also add GetLibraryVersionInfo() static method to wx{JPEG,PNG,TIFF}Handler,
wxStyledTextCtrl and wxXmlDocument classes and wxGetZlibVersionInfo() and
wxGetLibraryVersionInfo() global functions using it.

Closes #12690.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66259 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/imagjpeg.cpp

@@ -17,6 +17,7 @@
 #if wxUSE_IMAGE && wxUSE_LIBJPEG
 
 #include "wx/imagjpeg.h"
+#include "wx/versioninfo.h"
 
 #ifndef WX_PRECOMP
     #include "wx/log.h"
@@ -491,4 +492,9 @@ bool wxJPEGHandler::DoCanRead( wxInputStream& stream )
 
 #endif   // wxUSE_STREAMS
 
+/*static*/ wxVersionInfo wxJPEGHandler::GetLibraryVersionInfo()
+{
+    return wxVersionInfo("libjpeg", JPEG_LIB_VERSION/10, JPEG_LIB_VERSION%10);
+}
+
 #endif   // wxUSE_LIBJPEG