[Bug python/21688] `python` command ignores argument when invoked inside `if` clause

["sergiodj at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21688

--- Comment #2 from Sergio Durigan Junior <sergiodj at redhat dot com> ---
604c4576fdcfc4e7c28f569b3748a1b6b4e0dbd4 is the first bad commit
commit 604c4576fdcfc4e7c28f569b3748a1b6b4e0dbd4
Author: Jerome Guitton <guitton@adacore.com>
Date:   Tue Jan 10 15:15:53 2017 +0100

    Command abbreviation in define

    When defining a new macro, "command" is not recognized as an alias for
    "commands":

     (gdb) define breakmain
     Type commands for definition of "breakmain".
     End with a line saying just "end".
     >break main
     >command
     >echo "IN MAIN\n"
     >end
     (gdb)

    There is a special case for while-stepping, where 'ws' and 'stepping' are
    recognized explicitely. Instead of adding more special cases, this change
    uses cli-decode.

    gdb/ChangeLog:
            * cli/cli-decode.c (find_command_name_length): Make it extern.
            * cli/cli-decode.h (find_command_name_length): Declare.
            * cli/cli-script.c (command_name_equals, line_first_arg):
            New functions.
            (process_next_line): Use cli-decode to parse command names.
            (build_command_line): Make args a constant pointer.

    gdb/testsuite/ChangeLog:

            * gdb.base/define.exp: Add test for command abbreviations
            in define.

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