bpftool: Update to v7.5.0

bpftool: Update to v7.5.0

Update to the latest upstream release to include recent improvements and
bugfixes, and simplify use of PKG_SOURCE_VERSION.

This version supports BPF objects of either endianness, allowing for
introspection, linking and skeleton creation, and enables cross-compiling
modern BPF applications for targets with non-native byteorder.

Link: https://github.com/libbpf/bpftool/releases/tag/v7.5.0
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
Link: https://github.com/openwrt/openwrt/pull/17404
(cherry picked from commit 5bcad34154757bfaca1c787b1e9c72f4b1a52e37)
Link: https://github.com/openwrt/openwrt/pull/17418
Signed-off-by: Nick Hainke <vincent@systemli.org>