Support Older LibCurl Builds

[AndrewJackson2020]

We may want to consider supporting older libcurl builds with pg_net. The main reason for wanting to do this is that using such a bleeding edge libcurl severely limits the distribution of pg_net.

Looking at rockylinux, for example, pg_net will only build on rocky10 which very few people use. pg_net will absolutely not build on rocky8 or 9 which will be used for years in various enterprise orgs. I would imagine this looks the same for Debian/ubuntu. This reflects in the pgrpms repo where pg_net packages are only provided for EL10 but not EL 9 or EL8.

aj@Andrews-MacBook-Pro:~/Repos/mono/external/repos/public/ > podman run -it rockylinux:10 dnf list installed 'libcurl*'
Installed Packages
libcurl-minimal.aarch64                  8.12.1-4.el10                   @6aaf70bcffc94070bd561609732be3db
aj@Andrews-MacBook-Pro:~/Repos/mono/external/repos/public/ > podman run -it rockylinux:9 dnf list installed 'libcurl*'
WARNING: image platform (linux/amd64) does not match the expected platform (linux/arm64)
Installed Packages
libcurl-minimal.x86_64                   7.76.1-40.el9                   @e8f61db5984c4f5e99b7f40b07286614
aj@Andrews-MacBook-Pro:~/Repos/mono/external/repos/public/ > podman run -it rockylinux:8 dnf list installed 'libcurl*'
Installed Packages
libcurl-minimal.aarch64                               7.61.1-34.el8                                @System
aj@Andrews-MacBook-Pro:~/Repos/mono/external/repos/public/ >

aj@Andrews-MacBook-Pro:~/Repos/mono/external/repos/public/pgrpms/ > git remote -v
origin	https://git.postgresql.org/git/pgrpms.git (fetch)
origin	https://git.postgresql.org/git/pgrpms.git (push)

aj@Andrews-MacBook-Pro:~/Repos/mono/external/repos/public/pgrpms/ > find . | grep pgsql_http | grep EL | grep 18
./rpm/redhat/18/pgsql_http/EL-9
./rpm/redhat/18/pgsql_http/EL-10
./rpm/redhat/18/pgsql_http/EL-8

aj@Andrews-MacBook-Pro:~/Repos/mono/external/repos/public/pgrpms/ > find . | grep pg_net | grep EL | grep 18
./rpm/redhat/18/pg_net/EL-10