Use cpu count for python build.

Author: Maxwell175

build.mac.sh

@@ -279,7 +279,7 @@ export "LDFLAGS=-L${PREFIX}/lib"
   ax_cv_c_float_words_bigendian=no \
   ___ORIG_DEPS_PREFIX=${PREFIX}___
 
-make -j 32 \
+make -j $(sysctl -n hw.ncpu) \
         PROFILE_TASK='./Lib/test/regrtest.py -j 8 -x test_bsddb3 test_compiler test_cpickle test_cprofile test_dbm_dumb test_dbm_ndbm test_distutils test_ensurepip test_gdb test_io test_linuxaudiodev test_multiprocessing test_ossaudiodev test_platform test_pydoc test_socketserver test_subprocess test_sundry test_thread test_threaded_import test_threadedtempfile test_threading test_threading_local test_threadsignals test_xmlrpc test_zipfile' \
         profile-opt
 
@@ -318,4 +318,3 @@ $ELEVATE ln -s base "$target/dependency_libs/xz"
 $ELEVATE ln -s base "$target/dependency_libs/zlib"
 
 $ELEVATE "$target/bin/python${long_version}" -m rebuildpython
-