Changed regex used to ind xtables libs

Updated the regular expression for ldconfig versions packaged in glibc2.28 and greater

Closes #329

Author: AZaugg

iptc/xtables.py

@@ -805,7 +805,7 @@ class xtables_target(ct.Union):
 _xtables_libdir = os.getenv("XTABLES_LIBDIR")
 if _xtables_libdir is None:
     import re
-    ldconfig_path_regex = re.compile('^(/.*):$')
+    ldconfig_path_regex = re.compile('^(/.*):($| \(.*\)$)')
     import subprocess
     ldconfig = subprocess.Popen(
         ('/sbin/ldconfig', '-N', '-v'),