Update gdbinit

fix wrong path of libstdcxx python script

gdb/gdbinit

@@ -1,6 +1,15 @@
 python
 import sys
-sys.path.insert(0, sys.path[0] + '/../../%GCC_NAME%/python')
+import os
+from os import path
+dir_of_gcc = list(filter(lambda x: x.startswith('gcc'), os.listdir('/usr/share')))
+if len(dir_of_gcc) > 0:
+  dir_of_gcc = path.join('/usr/share', dir_of_gcc[0], 'python')
+  if not path.exists(dir_of_gcc):
+    dir_of_gcc = sys.path[0]
+else:
+  dir_of_gcc = sys.path[0]
+sys.path.insert(0, dir_of_gcc)
 from libstdcxx.v6.printers import register_libstdcxx_printers
 register_libstdcxx_printers (None)
-end
+end