Merge pull request #495 from freifunkMUC/fix/replace-cpuinfo-with-nproc

Replace grep cpuinfo with nproc

Makefile

@@ -18,7 +18,7 @@ else
 	GLUON_RELEASE := $(shell git describe --tags)~exp$(BUILD_NUMBER)
 endif
 
-JOBS ?= $(shell cat /proc/cpuinfo | grep processor | wc -l)
+JOBS ?= $(shell nproc)
 
 GLUON_MAKE := ${MAKE} -j ${JOBS} -C ${GLUON_BUILD_DIR} \
 	GLUON_RELEASE=${GLUON_RELEASE} \