!154 【轻量级 PR】：CI compile blocking bugfix

Merge pull request !154 from pilipala195/N/A

build.py

@@ -24,7 +24,7 @@ import subprocess
 def check_output(cmd, **kwargs):
     process = subprocess.Popen(cmd,
                                stdout=subprocess.PIPE,
-                               stderr=subprocess.PIPE,
+                               stderr=subprocess.STDOUT,
                                universal_newlines=True,
                                **kwargs)
     for line in iter(process.stdout.readline, ''):
@@ -34,11 +34,6 @@ def check_output(cmd, **kwargs):
     process.wait()
     ret_code = process.returncode
 
-    if ret_code != 0:
-        for line in iter(process.stderr.readline, ''):
-            sys.stdout.write(line)
-            sys.stdout.flush()
-
     return ret_code