don't rebuild the makefile based project if only companyName, projectName or productName are changed

And this fix current encoding issues, because all these information fields can
contain non-latin characters.

          <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"/>