Revert "eo_gdb.py: added eo_bt for eo_backtrace alias in an ugly way."

This reverts commit 4850c53350.

You can set the alias in the .gdbinit.
So my .gdbinit looks like:

source /usr/local/share/eo/gdb/eo_gdb.py
alias -a eo_bt = eo_backtrace

Special thanks to Alex-P. Natsios for the tip.

data/eo/eo_gdb.py

@@ -33,18 +33,3 @@ class Eo_backtrace(gdb.Command):
             print line
 
 Eo_backtrace()
-
-# ugly alias of eo_backtrace.
-# Very crude, but works for the meanwhile
-class Eo_bt(gdb.Command):
-   def __init__(self):
-      gdb.Command.__init__(self, "eo_bt", gdb.COMMAND_OBSCURE)
-
-   def invoke (self, arg, from_tty):
-      btrace = gdb.execute("backtrace", False, to_string=True).split('\n')
-
-      for line in btrace:
-         if line.find("libeo.so") == -1 and line.find("lib/eo/") == -1:
-            print line
-
-Eo_bt()