overly zealous git hook

[Bruno Haible]

Hi Jim,

The git server at savannah now rejects the normal form of module
descriptions. I got this error message:

  modules/pipe-filter:34: ends with blank lines.
  error: hooks/update exited with error code 2
  error: hook declined to update refs/heads/master

I understand that for .c, .h, .texi and many other files, a blank line
at the end of the file is an indication of sloppiness. Not so for
gnulib module description files.

A gnulib modules description formally consists of sections. Every section
consists of one or more lines. The first line of a section is a special
keyword, followed by a colon (such as 'Makefile.am:'). Then comes a number
of content lines. At the end comes - by convention - a blank line. The
sections are in arbitrary order.

Because a blank line actually belongs to the section that started before
it (see how it's parsed in gnulib-tool: variable sed_extract_prog), it's
not a separator. Therefore it's perfectly normal that module descriptions
end in 1 blank line.

Likewise for ChangeLog files: They consist of entries, each ending with a
blank line. Therefore, normally, a ChangeLog file ends with a blank line.

Can you please exempt the files under modules/ and the ChangeLog files
from this hooks/update check?

Bruno