https-dns-proxy: update to 2023.12.26-1

https-dns-proxy: update to 2023.12.26-1

Makefile:
* update to latest upstream version
* remove PKG_SOURCE_DATE/PKG_SOURCE_RELEASE as they are no longer needed
* set TARGET_CFLAGS/TARGET_LDFLAGS
* update CMAKE_OPTIONS
* add CONFIGURE_ARGS to prepare for building with HTTP/3
* update package URL to upstream repo instead of documentation
* update package/description
* add README.md with link to documentation

init-script:
* do not run within image builder
* add a line which can be uncommented to remove outdated doh_server entries

020-src-options.c-add-version.patch:
* remove it, as it's no longer needed with version set in CMAKE_OPTIONS

Signed-off-by: Stan Grishin <redacted>