[bug #16670] Repeated backslash-escaped newlines not POSIXly replaced

[Paul D. Smith]

Follow-up Comment #1, bug #16670 (project make):

OK, the fix for this is simple enough.  However, it does cause user-visible
changes.  It's not so much the replacing of each backslash/newline/following
whitespace with a space that's the issue, it's the fact that TRAILING
whitespace on the previous line is no longer condensed.  The current behavior
basically condenses ALL whitespace starting with the last non-whitespace
character on the previous line and going until the next non-whitespace
character (where backslash/newline are considered whitespace) and replaces it
with a single space.  So, in the current version of make this:

FOO = a        
     b

Gives a value of $(FOO) that is "a b".  In the new behavior this would give
"a         b", because the trailing whitespace on the previous line is
preserved, plus one extra space for the backslash/newline/following
whitespace.

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