Bug 1326496 - testing:mozbase: Use find_library to get libc filename.…

… r=ahal

On architectures like alpha and ia64, the glibc does not use the
canonical ABI version number 6 but 6.1 and therefore the filename
of the C library is not libc.so.6 but libc.so.6.1. We're therefore
making the Python code more flexible and use find_library from
ctypes.util to determine the filename from the environment instead
of hard-coding it.

--HG--
extra : rebase_source : 64676648cec9975045a6dfeae1cfc9213226e242

testing/mozbase/mozinfo/mozinfo/mozinfo.py

@@ -15,7 +15,7 @@
 import re
 import sys
 from .string_version import StringVersion
-
+from ctypes.util import find_library
 
 # keep a copy of the os module since updating globals overrides this
 _os = os
@@ -150,7 +150,7 @@ class OSVERSIONINFOEXW(ctypes.Structure):
     import errno
     PR_SET_SECCOMP = 22
     SECCOMP_MODE_FILTER = 2
-    ctypes.CDLL("libc.so.6", use_errno=True).prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, 0)
+    ctypes.CDLL(find_library("c"), use_errno=True).prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, 0)
     info['has_sandbox'] = ctypes.get_errno() == errno.EFAULT
 else:
     info['has_sandbox'] = True