[perl #38897] [TODO] fail during makefile generation if line ends in '/'

[Jerry Gay]

# New Ticket Created by jerry gay
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if slash replacement mode is active (as set in
config/gen/makefiles.pm) during makefile creation, and a line ends in
a slash, this will be replaced by a backslash on windows.

oops! backslash is the makefile line continuation character, and will
therefore corrupt the generated makefile. lib/parrot/configure/step's
genfile should die with a sane error message if this case occurs.

this task requires general makefile knowledge, and general perl
knowledge, and should be low-hanging fruit for lurkers (or others) who
want to contribute.

~jerry