Add make job limit to nproc

scripts/ci/rpi/addons-script.sh

@@ -3,9 +3,9 @@
 echo "Compiling addons."
 
 cd /home/pi/openFrameworks/addons/ofxOMXPlayer/example-basic
-make -j
+make -j $(nproc)
 
 cd /home/pi/openFrameworks/addons/ofxJSON/example_file_read_write
-make -j
+make -j $(nproc)
 
 echo "Compiling addons done!"

scripts/ci/rpi/finalize-script.sh

@@ -3,7 +3,7 @@
 echo "Finalizing OPM RPi image."
 
 cd /home/pi/openFrameworks/addons/ofxPiMapper/example_basic
-make -j
+make -j $(nproc)
 
 echo "Inastalling extra packages."
 sudo apt-get -yq install usbmount dosfstools exfat-fuse exfat-utils