CMakeLists: Align PKGCONF_REQ_PRIVATE required versions

[laf0rge]

The minimum version requirements are a bit odd: At build time of
ulfius, libmicrohttpd ">= 0.9.51" is sufficient, but then a pkg-config
file is installed stating "PKGCONF_REQ_PRIVATE > 0.9.51", i.e.
explicitly excluding 0.9.51 itself. The same is the case with gnutls
and libmicrohttpd 0.9.53 in case of websockets.

On the other hand, CPACK_DEBIAN_PACKAGE_DEPENDS again states ">=",
so we had two instances where ">=" was sufficient, but only one where
">" was required.

This matters on Debian stretch, where exactly version 0.9.51 of
libmicrohttpd is packaged and hence ulfius builds and gets packaged,
but then one cannot build any applications against ulfius.

[laf0rge]

would be great to tag a patch release (2.5.3.1 or 2.5.4) from 2.5.3 including this patch. I also have a similar patch against 2.5.2 available.

[babelouest]

Hello @laf0rge ,

Thanks for the pull request. Although the current working branch is 2.6, I will make the change there instead.

I would rather not release Ulfius 2.5.4 just for this, since Ulfius 2.6 is on the tracks.
Can I ask why you need a new release?

[laf0rge]

Hi Nicolas,

On Wed, Apr 03, 2019 at 05:45:42AM -0700, Nicolas Mora wrote: Thanks for the pull request. Although the current working branch is [2.6](https://github.com/babelouest/ulfius/tree/2.6), I will make the change there instead. I would rather not release Ulfius 2.5.4 just for this, since Ulfius 2.6 is on the tracks. Can I ask why you need a new release?

I think stable distributions like Debian don't usually switch to new major versions but rather prefer bug fixes to stable packages only. As you're maintaining your own packages in Debian, you must be a Debian developer and know better. Of course the distributions can carry a related patch themselves, but rather than making everyone carry a patch, I believe it's worth tagging a patch release. But hey, it's your project so your call.

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[babelouest]

I agree, since Ulfius 2.5 is now in Debian Buster, the branch 2.5 will live a long life. Sometimes I forget about long term support.

I'll take the opportunity to backport some changes from 2.6 though, then I'll release Ulfius 2.5.4 with your changes.