updated for version 7.4.495
Problem:    XPM isn't used correctly in the Cygwin Makefile.
Solution:   Include the rules like in Make_ming.mak. (Ken Takata)
Added tag v7-4-495 for changeset 0079791cbbea
updated for version 7.4.496
Problem:    Many lines are both in Make_cyg.mak and Make_ming.mak
Solution:   Move the common parts to one file. (Ken Takata)
Added tag v7-4-496 for changeset 112c80234ce3