compile_pkgs: by default use number of CPU instead of one job

compile_pkgs

@@ -69,7 +69,7 @@ FORCE="" # Force build
 EVERYTHING="" # Set this variable to build all packages not only minimal set
 CLONE_DEEP="" # Set this variable to clone OpenWRT tree in full depth not just latest commit
 BUILD_ARGS=() # Additional arguments passed to OpenWRT make call (note that this is for all make calls in OpenWRT)
-BUILD_JOBS="1" # Number of jobs to be passed to make calls
+BUILD_JOBS="$(nproc)" # Number of jobs to be passed to make calls
 SIGN_KEY="" # Path to private signing key
 GIT_MIRROR="" # Path to git mirror directory
 DL_MIRROR="" # Path to downloads mirror directory