maint: update help2man to 1.43.3

Instead of diverging further from the upstream GNU help2man project
(http://www.gnu.org/software/help2man/), hold a copy of the original
script and keep track of our changes in a separate patch file.

The man pages created with the new version show the following,
non-invasive differences:
a) command options in the EXAMPLE sections are no longer in bold format,
b) file names are underlined now consistently.

* man/help2man: Rename to ...
* man/help2man.in: ... this file, and update content from the
upstream GNU help2man project.
* man/help2man.diff: Add patch file for help2man to remove the
sentence "For complete documentation ..." (see commit 5d4f09d8),
and to emit "info coreutils 'PROG invocation'" into the man
pages (77abf69a).
* man/local.mk (mandeps): Add help2man to the dependencies of
the man pages.
(man/help2man): Add rule to generate this script from the upstream
help2man.in file and the help2man.diff patch.
* .gitignore: Add man/help2man as it is no longer version controlled.
* cfg.mk (sc_long_lines): Exempt help2man.in from this check.
(sc_po_check): Likewise.
(sc_space_tab): Likewise.
(sc_trailing_blank): Exempt man/help2man.diff from this check.
(sc_prohibit_tab_based_indentation): Instead of help2man, now exempt
both help2man.in and help2man.diff from this test.
* .x-update-copyright: Add new file and add the above new help2man
files as well as the COPYING file.

1 files changed, 6 insertions, 4 deletions

diff --git a/cfg.mk b/cfg.mk
index a4f36ff5f..61bda4bcc 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -221,11 +221,13 @@ sc_prohibit-gl-attributes:
 
 # Look for lines longer than 80 characters, except omit:
 # - program-generated long lines in diff headers,
+# - the original help2man script copied from upstream,
 # - tests involving long checksum lines, and
 # - the 'pr' test cases.
 LINE_LEN_MAX = 80
 FILTER_LONG_LINES =						\
   /^[^:]*\.diff:[^:]*:@@ / d;					\
+  \|^[^:]*man/help2man\.in:| d;			\
   \|^[^:]*tests/misc/sha[0-9]*sum.*\.pl[-:]| d;			\
   \|^[^:]*tests/pr/|{ \|^[^:]*tests/pr/pr-tests:| !d; };
 sc_long_lines:
@@ -566,10 +568,10 @@ update-copyright-env = \
 
 # List syntax-check exemptions.
 exclude_file_name_regexp--sc_space_tab = \
-  ^(tests/pr/|tests/misc/nl\.sh$$|gl/.*\.diff$$)
+  ^(tests/pr/|tests/misc/nl\.sh$$|gl/.*\.diff$$|man/help2man\.diff$$)
 exclude_file_name_regexp--sc_bindtextdomain = \
   ^(gl/.*|lib/euidaccess-stat|src/make-prime-list)\.c$$
-exclude_file_name_regexp--sc_trailing_blank = ^tests/pr/
+exclude_file_name_regexp--sc_trailing_blank = ^(tests/pr/|man/help2man.diff)
 exclude_file_name_regexp--sc_system_h_headers = \
   ^src/((system|copy)\.h|libstdbuf\.c|make-prime-list\.c)$$
 
@@ -579,7 +581,7 @@ exclude_file_name_regexp--sc_require_config_h_first = \
 exclude_file_name_regexp--sc_require_config_h = \
   $(exclude_file_name_regexp--sc_require_config_h_first)
 
-exclude_file_name_regexp--sc_po_check = ^gl/
+exclude_file_name_regexp--sc_po_check = ^(gl/|man/help2man\.in)
 exclude_file_name_regexp--sc_prohibit_always-defined_macros = \
   ^src/(seq|remove)\.c$$
 exclude_file_name_regexp--sc_prohibit_empty_lines_at_EOF = ^tests/pr/
@@ -599,7 +601,7 @@ exclude_file_name_regexp--sc_useless_cpp_parens = $(_ll)
 exclude_file_name_regexp--sc_long_lines = $(_ll)
 exclude_file_name_regexp--sc_space_before_open_paren = $(_ll)
 
-tbi_1 = ^tests/pr/|(^gl/lib/reg.*\.c\.diff|\.mk|^man/help2man)$$
+tbi_1 = ^tests/pr/|(^gl/lib/reg.*\.c\.diff|\.mk|^man/help2man\.(in|diff))$$
 tbi_2 = ^scripts/git-hooks/(pre-commit|pre-applypatch|applypatch-msg)$$
 tbi_3 = (GNU)?[Mm]akefile(\.am)?$$|$(_ll)
 exclude_file_name_regexp--sc_prohibit_tab_based_indentation = \