MAKEALL: fix awk warning message

If you do `./MAKEALL -M ` or `./MAKEALL -m`
GNU awk would display warnings like follows:

    awk: warning: escape sequence `\ ' treated as plain ` '

In the first place, we do not explicitly set the field separator.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>