Remove LaunchURL()

Unused and insecure.

Related to https://gitlab.com/kicad/code/kicad/-/issues/9236

common/launch_ext.cpp

@@ -40,13 +40,3 @@ void LaunchExternal( const wxString& aPath )
     wxLaunchDefaultApplication( path );
 #endif
 }
-
-
-void LaunchURL( const wxString& aUrl )
-{
-#ifdef __WXMAC__
-    wxExecute( wxString::Format( "open %s", aUrl ) );
-#else
-    wxLaunchDefaultApplication( aUrl );
-#endif
-}

include/launch_ext.h

@@ -29,10 +29,4 @@ class wxString;
  */
 void LaunchExternal( const wxString& aPath );
 
-/**
- * Attempts to launch a given URL in the user's browser
- * @param aUrl is a valid URL (already escaped)
- */
-void LaunchURL( const wxString& aUrl );
-
 #endif