Win32: Roll back Gwenhywfar to 4.9.0 to resolve broken build.

cc1.exe: warnings being treated as errors
In file included from c:/soft/aqbanking/include/aqbanking5/aqbanking/abgui.h:16:0,
                 from ../../../../repos/src/import-export/aqb/gnc-ab-utils.c:52:
c:/soft/gwenhywfar/include/gwenhywfar4/gwenhywfar/gui_be.h:60:10: error: 'libintl_printf' is an unrecognized format function type
make[5]: *** [gnc-ab-utils.lo] Error 1

packaging/win32/defaults.sh

@@ -343,7 +343,7 @@ set_default LIBOFX_DIR $GLOBAL_DIR\\libofx
 #set_default LIBOFX_PATCH `pwd`/libofx-x.x.x.patch
 
 ## online banking: gwenhywfar+aqbanking
-GWENHYWFAR_VERSION="4.11.0beta"
+GWENHYWFAR_VERSION="4.9.0beta"
 set_default GWENHYWFAR_URL "http://www2.aquamaniac.de/sites/download/download.php?package=01&release=74&file=01&dummy=gwenhywfar-${GWENHYWFAR_VERSION}.tar.gz"
 set_default GWENHYWFAR_DIR $GLOBAL_DIR\\gwenhywfar