- n_no-compress-on-sle.patch
* we can't handle .Z files, since we don't have ncompress package
on SLE; so disable this feature as before (bsc#1207031)
- BuildRequires
* removed again ncompress
* added again autoconf, automake, libtool
- run again autoreconf due to patch above

- update to 3.5.15:
* Use gzip -d instead of gunzip
* Prevent a double free in the error code path
* Fix CVE-2022-4883: compression commands depend on $PATH
* Fix CVE-2022-44617: Runaway loop with width of 0 and enormous height
* test: add test cases for CVE-2022-44617 (zero-width w/enormous height)
* Fix CVE-2022-46285: Infinite loop on unclosed comments
* test: add test case for CVE-2022-46285 (unclosed comments)
* cxpm: getc/ungetc wrappers should not adjust position when c == EOF
* test: Add unit tests using glib framework
* configure: add --disable-open-zfile instead of requiring -DNO_ZPIPE
* man pages: Apply standard man page style/formatting
* man pages: Replace "See Also" entries with more useful ones
* man pages: Fix typos and other minor editing
- drop U_0001-configure-add-disable-open-zfile-instead-of-requirin.patch,
U_0002-Fix-CVE-2022-46285-Infinite-loop-on-unclosed-comment.patch,
U_0004-Fix-CVE-2022-44617-Runaway-loop-with-width-of-0-and-.patch,
U_0005-Fix-CVE-2022-4883-compression-commands-depend-on-PAT.patch,
U_regression-bug1207029_1207030_1207031.patch
U_regression2-bug1207029_1207030_1207031.patch: upstream
- switch urls to https
- spec file cleanups