adblock-fast: update to 1.2.4-4

adblock-fast: update to 1.2.4-4

Maintainer: me
Compile tested: x86_64, Dell EMC Edge620, OpenWrt 25.12.4
Run tested: x86_64, Dell EMC Edge620, OpenWrt 25.12.4

Description:
Update to PKG_RELEASE 4

  - Bump PKG_RELEASE from 2 to 4.
  - Add PKG_CPE_ID.

files/lib/adblock-fast/adblock-fast.uc:
  - Adjust logic for determining the gzip cache path to align with
    the new 'compressed_cache' option.
  - Remove dependency on 'compressed_cache_dir' for gzip path
    construction.
  - Update gzip path calculation in 'get_init_status' to use the new
    'compressed_cache' option.

Signed-off-by: Stan Grishin <redacted>