Win32 installer: regroup the webplugins options

extras/package/win32/languages/declaration.nsh

 Var Name_Section01
 Var Name_Section02a
 Var Name_Section02b
+Var Name_Section34
 Var Name_Section03
 Var Name_Section04
 Var Name_Section05

extras/package/win32/languages/english.nsh

 StrCpy $Name_Section01 "Media Player (required)"
 StrCpy $Name_Section02a "Start Menu Shortcut"
 StrCpy $Name_Section02b "Desktop Shortcut"
+StrCpy $Name_Section34 "Web plugins"
 StrCpy $Name_Section03 "Mozilla plugin"
 StrCpy $Name_Section04 "ActiveX plugin"
 StrCpy $Name_Section05 "Discs Playback"

extras/package/win32/vlc.win32.nsi.in

@@ -256,6 +256,7 @@ Section $Name_Section02b SEC02b
     "$INSTDIR\vlc.exe" ""
 SectionEnd
 
+SectionGroup /e !$Name_Section34
 !ifdef INSTALL_MOZILLA
 Section $Name_Section03 SEC03
   SectionIn 1 3
@@ -287,6 +288,7 @@ Section $Name_Section04 SEC04
   RegDLL "$INSTDIR\axvlc.dll"
 SectionEnd
 !endif
+SectionGroupEnd
 
 
 Section $Name_Section05 SEC05