target: zephyr: Allow parallel build of Zephyr (#1436)
target: zephyr: Allow parallel build of Zephyr (#1436)

If we are building JerryScript from some other makefile that passes
down a -j option to make we should respect that when we build Zephyr.

JerryScript-DCO-1.0-Signed-off-by: Kumar Gala kumar.gala@linaro.org
yichoi/jerryscript,robertsipka/jerryscript,jerryscript-project/jerryscript,jack60504/jerryscript,yichoi/jerryscript,LeeHayun/jerryscript,jack60504/jerryscript,grgustaf/jerryscript,jerryscript-project/jerryscript,jerryscript-project/jerryscript,loki04/jerryscript,loki04/jerryscript,tilmannOSG/jerryscript,grgustaf/jerryscript,tilmannOSG/jerryscript,yichoi/jerryscript,akosthekiss/jerryscript,martijnthe/jerryscript,loki04/jerryscript,slaff/jerryscript,glistening/jerryscript,dbatyai/jerryscript,LaszloLango/jerryscript,dbatyai/jerryscript,glistening/jerryscript,grgustaf/jerryscript,gabrielschulhof/jerryscript,robertsipka/jerryscript,martijnthe/jerryscript,glistening/jerryscript,grgustaf/jerryscript,bzsolt/jerryscript,martijnthe/jerryscript,slaff/jerryscript,slaff/jerryscript,gabrielschulhof/jerryscript,bzsolt/jerryscript,bsdelf/jerryscript,tilmannOSG/jerryscript,loki04/jerryscript,gabrielschulhof/jerryscript,gabrielschulhof/jerryscript,jerryscript-project/jerryscript,jack60504/jerryscript,dbatyai/jerryscript,grgustaf/jerryscript,bzsolt/jerryscript,bzsolt/jerryscript,zherczeg/jerryscript,slaff/jerryscript,akosthekiss/jerryscript,zherczeg/jerryscript,LeeHayun/jerryscript,glistening/jerryscript,glistening/jerryscript,LeeHayun/jerryscript,bzsolt/jerryscript,tilmannOSG/jerryscript,bsdelf/jerryscript,LeeHayun/jerryscript,loki04/jerryscript,akosthekiss/jerryscript,LeeHayun/jerryscript,dbatyai/jerryscript,tilmannOSG/jerryscript,robertsipka/jerryscript,LaszloLango/jerryscript,akosthekiss/jerryscript,martijnthe/jerryscript,zherczeg/jerryscript,glistening/jerryscript,robertsipka/jerryscript,jack60504/jerryscript,loki04/jerryscript,robertsipka/jerryscript,akosthekiss/jerryscript,yichoi/jerryscript,jack60504/jerryscript,robertsipka/jerryscript,martijnthe/jerryscript,LaszloLango/jerryscript,zherczeg/jerryscript,bsdelf/jerryscript,grgustaf/jerryscript,bsdelf/jerryscript,yichoi/jerryscript,bsdelf/jerryscript,gabrielschulhof/jerryscript,jerryscript-project/jerryscript,dbatyai/jerryscript,slaff/jerryscript,LaszloLango/jerryscript,bsdelf/jerryscript,zherczeg/jerryscript,martijnthe/jerryscript,LaszloLango/jerryscript,jack60504/jerryscript