missed COM_FOR_BUILD in config_host.mk.in

config_host.mk.in

@@ -9,6 +9,7 @@ export CAIRO_LIBS="@CAIRO_LIBS@"
 export CDR_CFLAGS="@CDR_CFLAGS@"
 export CDR_LIBS="@CDR_LIBS@"
 export COM="@COM@"
+export COM_FOR_BUILD="@COM_FOR_BUILD@"
 export CPPUNIT_CFLAGS="@CPPUNIT_CFLAGS@"
 export CPPUNIT_LIBS="@CPPUNIT_LIBS@"
 export CPU="@CPU@"