OS-2094	ON tools should honor $MAKE
OS-2095 cmd/refer Makefile is a bit bogus
OS-2096 xref hardcodes its path
OS-2097 lex should check $origin for support files
OS-2098 yacc should check $origin for support files
OS-2099 remove OS-1583 workaround
OS-2100 ndmp makefiles need to use $(RPCGEN)
OS-2101 Need a way to specify ast binary directory