gnome-keyring: Fix build error due to missing asn1 prototypes

This fixes the errors that started to pop up recently
while building gnome-keyring as part of gnome images
The error is decribed in patch header

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>