beremiz

check_source.sh: fix sed error: -e expression #1, char 25: Invalid range end

Warning happen only if old sed (4.4) is used.
<xsd:attribute name="Command" type="xsd:string" use="optional" default="make -C %(buildpath)s all BEREMIZSRC=%(src)s BEREMIZCFLAGS=%(cflags)s MD5=%(md5)s USE_BEREMIZ=1 FROM_BEREMIZ=1"/>