Travis: allow build/make to print output
Travis: allow build/make to print output

As we have now matrix for targets, there might be some targets that take longer to compile.
It can timeout, if we produce an output after every target that it was build, it
should extend the timeout per target build.

andcor02/mbed-os,kjbracey-arm/mbed,karsev/mbed-os,kjbracey-arm/mbed,andcor02/mbed-os,andcor02/mbed-os,andcor02/mbed-os,Archcady/mbed-os,c1728p9/mbed-os,kjbracey-arm/mbed,karsev/mbed-os,betzw/mbed-os,betzw/mbed-os,mazimkhan/mbed-os,c1728p9/mbed-os,karsev/mbed-os,mazimkhan/mbed-os,kjbracey-arm/mbed,betzw/mbed-os,karsev/mbed-os,betzw/mbed-os,mazimkhan/mbed-os,mbedmicro/mbed,mbedmicro/mbed,mazimkhan/mbed-os,karsev/mbed-os,mbedmicro/mbed,Archcady/mbed-os,c1728p9/mbed-os,andcor02/mbed-os,Archcady/mbed-os,mazimkhan/mbed-os,Archcady/mbed-os,karsev/mbed-os,andcor02/mbed-os,mazimkhan/mbed-os,Archcady/mbed-os,mbedmicro/mbed,betzw/mbed-os,c1728p9/mbed-os,c1728p9/mbed-os,mbedmicro/mbed,betzw/mbed-os,Archcady/mbed-os,c1728p9/mbed-os