Fix a build error (#1895)
Fix a build error (#1895)

Fixed an error when neither of libraries are found the build fails.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu
bsdelf/jerryscript,dbatyai/jerryscript,jerryscript-project/jerryscript,zherczeg/jerryscript,jack60504/jerryscript,bsdelf/jerryscript,glistening/jerryscript,jerryscript-project/jerryscript,yichoi/jerryscript,bsdelf/jerryscript,dbatyai/jerryscript,bsdelf/jerryscript,bzsolt/jerryscript,grgustaf/jerryscript,robertsipka/jerryscript,glistening/jerryscript,jack60504/jerryscript,robertsipka/jerryscript,dbatyai/jerryscript,bsdelf/jerryscript,jack60504/jerryscript,dbatyai/jerryscript,zherczeg/jerryscript,gabrielschulhof/jerryscript,LaszloLango/jerryscript,yichoi/jerryscript,grgustaf/jerryscript,yichoi/jerryscript,zherczeg/jerryscript,robertsipka/jerryscript,jerryscript-project/jerryscript,glistening/jerryscript,gabrielschulhof/jerryscript,jack60504/jerryscript,LaszloLango/jerryscript,grgustaf/jerryscript,jerryscript-project/jerryscript,robertsipka/jerryscript,yichoi/jerryscript,jack60504/jerryscript,dbatyai/jerryscript,gabrielschulhof/jerryscript,bzsolt/jerryscript,zherczeg/jerryscript,bzsolt/jerryscript,grgustaf/jerryscript,bsdelf/jerryscript,LaszloLango/jerryscript,jack60504/jerryscript,bzsolt/jerryscript,LaszloLango/jerryscript,zherczeg/jerryscript,glistening/jerryscript,grgustaf/jerryscript,LaszloLango/jerryscript,akosthekiss/jerryscript,glistening/jerryscript,akosthekiss/jerryscript,akosthekiss/jerryscript,bzsolt/jerryscript,glistening/jerryscript,gabrielschulhof/jerryscript,akosthekiss/jerryscript,robertsipka/jerryscript,akosthekiss/jerryscript,grgustaf/jerryscript,yichoi/jerryscript,jerryscript-project/jerryscript,gabrielschulhof/jerryscript,robertsipka/jerryscript