Re: small fix of libtool.m4

[Roumen Petrov]

Christian wrote:
> so today i gave it a shot again and put a debug output right before the ‘$RM 
> “$cfgfile”’. For some reason RM is set to ‘/bin/rm’ only. no ‘-f’. i’ll try to 
> figure out where that might come from.
Perhaps build package is libxslt .
Issue is already reported many times. Project use AC_PATH_PROG to find 
rm command.

May be change variable name to lt_RM is solution

Regards,
Roumen