wine.inf: Set gecko url to activate Wine Gecko installer.

tools/wine.inf

diff --git a/tools/wine.inf b/tools/wine.inf
index 4f922df..0307d50 100644
--- a/tools/wine.inf
+++ b/tools/wine.inf
@@ -289,6 +289,7 @@
 HKLM,System\CurrentControlSet\Control\VMM32Files,,,""
 HKLM,System\CurrentControlSet\Services\VxD\MSTCP,,,""
 HKCU,Software\Wine\shdocvw,"MozillaUrl",,"http://source.winehq.org/mozactivex"
+HKCU,Software\Wine\MSHTML,"GeckoUrl",,"http://source.winehq.org/winegecko.php"
 HKLM,HARDWARE\DEVICEMAP\PARALLEL PORTS,,,""
 HKLM,HARDWARE\DEVICEMAP\SERIALCOMM,,,""