Comment 2 for bug 1702229

I got the "NM_DIR_6.7 = $(GNU_BIN)" line from Fermilab many years ago, don't know if they had an unusual installation but I'm happy to make that fix, and to add WIND_HOME. Similarly the new NM_DIR settings, I never had a VxWorks 6.x installation before 6.4.

I wanted to avoid calculating the WORKBENCH_VERSION and UTILITIES_VERSION values because I believe it is possible to have installations where those version numbers are different. However I think the CONFIG_SITE file can override the calculated value, so we can have both.