libsoup-2.4.sym: remove nonexistent symbol
libsoup-2.4.sym: remove nonexistent symbol

It was added accidentally at 1c71cb223b00eaa5c776229d9e0312ba852ef87a

https://bugzilla.gnome.org/show_bug.cgi?id=738003

fanc999/libsoup,jwendell/libsoup,fanc999/libsoup,fanc999/libsoup,jwendell/libsoup,jwendell/libsoup,jwendell/libsoup,jwendell/libsoup,fanc999/libsoup,fanc999/libsoup