Fixing missing initializer warning for unused fields in extension declarations.
Fixing missing initializer warning for unused fields in extension declarations.

glistening/jerryscript,loki04/jerryscript,zherczeg/jerryscript,robertsipka/jerryscript,grgustaf/jerryscript,LeeHayun/jerryscript,zherczeg/jerryscript,glistening/jerryscript,LaszloLango/jerryscript,robertsipka/jerryscript,jack60504/jerryscript,dbatyai/jerryscript,grgustaf/jerryscript,loki04/jerryscript,dbatyai/jerryscript,bsdelf/jerryscript,martijnthe/jerryscript,jack60504/jerryscript,yichoi/jerryscript,akosthekiss/jerryscript,martijnthe/jerryscript,jerryscript-project/jerryscript,bzsolt/jerryscript,tilmannOSG/jerryscript,LeeHayun/jerryscript,jerryscript-project/jerryscript,LaszloLango/jerryscript,bzsolt/jerryscript,grgustaf/jerryscript,loki04/jerryscript,bzsolt/jerryscript,glistening/jerryscript,slaff/jerryscript,jerryscript-project/jerryscript,akosthekiss/jerryscript,akosthekiss/jerryscript,bsdelf/jerryscript,bzsolt/jerryscript,loki04/jerryscript,bsdelf/jerryscript,LeeHayun/jerryscript,martijnthe/jerryscript,martijnthe/jerryscript,dbatyai/jerryscript,jerryscript-project/jerryscript,loki04/jerryscript,tilmannOSG/jerryscript,tilmannOSG/jerryscript,glistening/jerryscript,LaszloLango/jerryscript,gabrielschulhof/jerryscript,bsdelf/jerryscript,grgustaf/jerryscript,martijnthe/jerryscript,jack60504/jerryscript,robertsipka/jerryscript,yichoi/jerryscript,LeeHayun/jerryscript,robertsipka/jerryscript,gabrielschulhof/jerryscript,yichoi/jerryscript,martijnthe/jerryscript,LaszloLango/jerryscript,slaff/jerryscript,glistening/jerryscript,zherczeg/jerryscript,slaff/jerryscript,robertsipka/jerryscript,slaff/jerryscript,tilmannOSG/jerryscript,zherczeg/jerryscript,bsdelf/jerryscript,gabrielschulhof/jerryscript,dbatyai/jerryscript,dbatyai/jerryscript,jack60504/jerryscript,gabrielschulhof/jerryscript,jerryscript-project/jerryscript,bzsolt/jerryscript,robertsipka/jerryscript,akosthekiss/jerryscript,gabrielschulhof/jerryscript,grgustaf/jerryscript,LaszloLango/jerryscript,grgustaf/jerryscript,akosthekiss/jerryscript,yichoi/jerryscript,loki04/jerryscript,zherczeg/jerryscript,LeeHayun/jerryscript,slaff/jerryscript,glistening/jerryscript,tilmannOSG/jerryscript,yichoi/jerryscript,jack60504/jerryscript,jack60504/jerryscript,bsdelf/jerryscript