gnulib-tool.py: Accept valid make syntax for escaped newlines.

[Collin Funk]

I noticed that in a few places where gnulib-tool.sh uses
'combine_lines', gnulib-tool.py uses 'remove_backslash_newline'.

These functions behave differently. Using this Makefile:

$ cat Makefile 

FILES = file1.c\
file2.c\
file3.c

all:
        @echo $(FILES)

$ make
file1.c file2.c file3.c

The 'combine_lines' functions adds spaces when replacing the backslash
newlines. The 'remove_backslash_newline' doesn't. In other words, we
would get this string returned in gnulib-tool.py:

file1.cfile2.cfile3.c

I don't think that our module files or Makefiles are ever written like
this. But since gnulib-tool.sh accepts it, and it is valid Make,
gnulib-tool.py should accept it too.

Collin

0001-gnulib-tool.py-Accept-valid-make-syntax-for-escaped-.patch
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