Add -mod-devel subpackage for building external nginx modules (Neal Gompa)

Resolves: #1991796 - build nginx with --with-compat

new version 1.20.0
Resolves: #1945671 - RFE: add nginx:1.20 module stream

Resolves: #1651377 - centralizing default index.html on nginx
Resolves: #1825683 - Outdated Red Hat branding used in nginx default pages

new version 1.18.0
Resolves: #1668717 - [RFE] Support loading certificates from hardware token
Increased types_hash_max_size to 4096 in default config
Drop location / from default config (rhbz#1564768)
Drop default_sever from default config (rhbz#1373822)

update to 1.16.1
Resolves: #1745697 - CVE-2019-9511 nginx:1.16/nginx: HTTP/2: large amount
Resolves: #1745690 - CVE-2019-9513 nginx:1.16/nginx: HTTP/2: flood using
Resolves: #1745645 - CVE-2019-9516 nginx:1.16/nginx: HTTP/2: 0-length

Resolves: #1718929 - ssl_protocols config option has faulty behavior

new version 1.16.0
enable ngx_stream_ssl_preread module
main package does NOT require all-modules package

enable TLS 1.3 by default (#1643647)
TLSv1.0 and TLSv1.1 can be enabled now (#1644746)

fix unexpanded paths in nginx(8) (#1643069)

Resolves: #1655530 - Hardening tests fail for nginx

new version 1.14.1
Resolves: #1647257 - CVE-2018-16845 nginx: Denial of service and
Resolves: #1647262 - CVE-2018-16844 nginx: Excessive CPU usage
Resolves: #1647263 - CVE-2018-16843 nginx: Excessive memory consumption

fix PKCS#11 support (Anderson Sasaki, #1545526)

add dependency on perl(constant)

Resolves: #1558420 - directory permissions are now correct after processing
Resolves: #1601414 - nginx: drop GeoIP support

add build conditional for geoip support