fix: stop pinning libcurl4-gnutls-dev, fixing curl -dev conflict

The zoneminder runtime Depends listed libcurl4-gnutls-dev, a build-time
-dev package. The curl -dev flavors (gnutls/openssl/nss) are mutually
exclusive, so installing zoneminder forced the gnutls dev flavor and
conflicted with packages requiring libcurl4-openssl-dev.

Remove the explicit curl entries from the runtime Depends: ZoneMinder
links libcurl directly, so ${shlibs:Depends} already generates the
correct runtime library dependency for the flavor it was built against.

Offer libcurl4-gnutls-dev | libcurl4-openssl-dev | libcurl4-nss-dev in
Build-Depends (matching distros/debian/control) so the build env can
satisfy a co-installed package needing libcurl4-openssl-dev.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
(cherry picked from commit 428b9d64d0)

distros/beowulf/control

@@ -13,7 +13,7 @@ Build-Depends: debhelper, sphinx-doc, dh-linktree, dh-apache2
               ,ffmpeg
               ,net-tools
               ,libbz2-dev
-              ,libcurl4-gnutls-dev
+              ,libcurl4-gnutls-dev | libcurl4-openssl-dev | libcurl4-nss-dev
               ,libturbojpeg0-dev
               ,default-libmysqlclient-dev | libmysqlclient-dev | libmariadbclient-dev-compat
               ,libpcre2-dev

distros/ubuntu2004/control

@@ -14,7 +14,7 @@ Build-Depends: debhelper (>= 11), sphinx-doc, python3-sphinx, python3-sphinx-rtd
               ,arp-scan
               ,net-tools, iproute2
               ,libbz2-dev
-              ,libcurl4-gnutls-dev
+              ,libcurl4-gnutls-dev | libcurl4-openssl-dev | libcurl4-nss-dev
               ,libjpeg-turbo8-dev | libjpeg62-turbo-dev | libjpeg8-dev | libjpeg9-dev
               ,libturbojpeg0-dev
               ,default-libmysqlclient-dev | libmysqlclient-dev | libmariadbclient-dev-compat
@@ -47,7 +47,6 @@ Depends: ${shlibs:Depends}, ${misc:Depends}, ${perl:Depends}
         ,libswscale9|libswscale8|libswscale7|libswscale6|libswscale5|libswscale4
         ,libswresample6|libswresample5|libswresample4|libswresample3|libswresample2
         ,ffmpeg
-        ,libcurl4, libcurl4-gnutls-dev
         ,libdatetime-perl, libdate-manip-perl, libmime-lite-perl, libmime-tools-perl
         ,libdbd-mysql-perl
         ,libphp-serialization-perl