Make the build reproducible

help2man was vendored as part of d5d5253 (Fix bugs reported by
Dominique, 2000-10-06) because at the time, help2man did not have a
--version-option argument and one needed to be patched in. However, as
of help2man 1.29, released in July 2003, this option was added.

Remove the vendored version of help2man and use the help2man on the
system. It's been released for long enough that all users should be
using a version of help2man that's less than 22 years old.

This helps because distros such as Arch Linux patch the vendored version
of help2man in order to make the build reproducible[0]. However, help2man
has been updated to support $SOURCE_DATE_EPOCH for a long time now.

Add -n to the gzip call so that the timestamp of the files are not
saved.

While we're at it, add the generated files to the .gitignore.

[0]: https://gitlab.archlinux.org/archlinux/packaging/packages/lsb-release/-/blob/e5ce86591a488e1089e1c246a296adc70679588b/lsb_release_make_man_page_reproducible.patch

Author: Denton-L

.gitignore

@@ -0,0 +1,2 @@
+*.1
+*.1.gz

lsb_release/README

@@ -1,6 +1,6 @@
 This directory contains:
 
-src - directory containing the source for lsb_release 
+src - directory containing the source for lsb_release
 lsb-release.spec - the spec file for generating RPM packages for lsb_release
 debian - directory containing the necessary configuration files for
          generating a deb packages for lsb_release
@@ -9,10 +9,10 @@ debian - directory containing the necessary configuration files for
 Generating a release
 --------------------
 
-The man page for lsb_release is automatically created by a modified
-version of the help2man program when the packages are constructed. The
-Makefile in the src subdirectory contains the command line arguments
-needed. The modified version of help2mn is included in this package.
+The man page for lsb_release is automatically created by the help2man
+program when the packages are constructed. Please ensure that the
+program is available on the build system. The Makefile in the src
+subdirectory contains the command line arguments needed.
 
 1. Checkout a tagged release (eg Release_1_1) or a snapshot
 

lsb_release/src/Makefile

@@ -21,8 +21,8 @@ all: man
 man: lsb_release.1.gz
 
 lsb_release.1.gz: lsb_release
-	@./help2man -N --include ./lsb_release.examples --alt_version_key=program_version ./lsb_release >lsb_release.1
-	@gzip -9f lsb_release.1
+	@help2man -N --include ./lsb_release.examples --version-option=--program_version ./lsb_release >lsb_release.1
+	@gzip -9fn lsb_release.1
 
 install: all
 	install -D -m 644 lsb_release.1.gz ${mandir}/man1/lsb_release.1.gz