fix(tools): various Makefile improvements

- sync output recursively for make calls
- add a script to get the number of cpus on mac and linux
- Makefile formatting
- update serialize_targets.sh to invoke the proper make binary
- Add instructions to install make

script/make_utils/ncpus.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+if [[ `uname` == "Darwin" ]]; then
+    sysctl -n hw.logicalcpu
+else
+    nproc
+fi

script/make_utils/serialize_targets.sh

@@ -4,8 +4,12 @@ set +e
 
 EXIT_CODE=0
 
+# Get the make executable
+MAKE="$1"
+shift
+
 for make_target in "$@"; do
-    make --no-print-directory "${make_target}"
+    "${MAKE}" --no-print-directory "${make_target}"
     if [[ "$?" != "0" ]]; then
         EXIT_CODE=1
     fi