update local conf version

build/conf/local.conf

@@ -256,7 +256,7 @@ PACKAGECONFIG:append:pn-nativesdk-qemu = " sdl"
 # CONF_VERSION is increased each time build/conf/ changes incompatibly and is used to
 # track the version of this file when it was generated. This can safely be ignored if
 # this doesn't mean anything to you.
-CONF_VERSION = "1"
+CONF_VERSION = "2"
 
 # Delete the the source/object/binary files once a package is built to preserve disk space
 INHERIT += "rm_work"
@@ -283,3 +283,5 @@ YARN_CACHE_DIR = ""
 ELECTRON_CACHE_DIR = ""
 SIGNING_KEY = ""
 DATADOG_API_KEY = ""
+
+PARALLEL_MAKE ?= "-j ${@oe.utils.cpu_count()}"