packaging: Add Fedora 40 and 39 support

Add dhtnet.spec for RPM build and fedora-40,39 dockerfile for env build.
Fix and changes was required in Cmake instruction in order to build:
- Add `llhttp` and `neddle` library linking when building tools
- `llhttp` liking is disabled by default for debian, enabled for fedora
- Remove occurence of INSTALL_DIR path in dhtnet.pc and dnc.service

Change-Id: I2f2161d7c65241a35c4acbcc006ba27bfcc1f176