[bug-diffutils] bug#72236: generate programs' man pages in the source directory, per GCS

[Bruno Haible]

The files man/*.1 are included in the tarballs. By the GNU Coding Standards
<https://www.gnu.org/prep/standards/html_node/Makefile-Basics.html>
they should be generated in the source directory.

But this is not what happens:

$ ./configure; make -k maintainer-clean
$ ./bootstrap
$ mkdir bb
$ cd bb
$ ../configure
$ make
$ ls -l ../man/*.1
ls: cannot access '../man/*.1': No such file or directory
$ ls -l man/*.1
-rw-rw-r-- 1 bruno bruno 2245 21. Jul 21:12 man/cmp.1
-rw-rw-r-- 1 bruno bruno 6469 21. Jul 21:12 man/diff.1
-rw-rw-r-- 1 bruno bruno 2858 21. Jul 21:12 man/diff3.1
-rw-rw-r-- 1 bruno bruno 2869 21. Jul 21:12 man/sdiff.1

This patch fixes it.

With it, the result is:

$ ls -l ../man/*.1
-rw-rw-r-- 1 bruno bruno 2245 21. Jul 21:16 ../man/cmp.1
-rw-rw-r-- 1 bruno bruno 6469 21. Jul 21:16 ../man/diff.1
-rw-rw-r-- 1 bruno bruno 2858 21. Jul 21:16 ../man/diff3.1
-rw-rw-r-- 1 bruno bruno 2869 21. Jul 21:16 ../man/sdiff.1
$ ls -l man/*.1
ls: cannot access 'man/*.1': No such file or directory

0001-build-Generate-programs-man-pages-in-the-source-dire.patch
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