tools/dwarves: update to v1.27

tools/dwarves: update to v1.27

Update to the latest upstream version and add a patch that enables pahole
reproducible builds if SOURCE_DATE_EPOCH is defined in the environment.

This patch helps avoid BTF-related module loading problems with packages
built separately from the kernel such as mac80211 or kselftests-bpf, e.g.:

    [   16.858856] BPF:      type_id=1185 bits_offset=0
    [   16.859099] BPF:
    [   16.859199] BPF: Invalid name
    [   16.859352] BPF:
    [   16.859612] failed to validate module [cfg80211] BTF: -22
    [   17.015178] PPP generic driver version 2.4.2
    [   17.052703] NET: Registered PF_PPPOX protocol family
    [   17.348722] BPF:      type_id=1185 bits_offset=0
    [   17.348912] BPF:
    [   17.348996] BPF: Invalid name
    [   17.349106] BPF:
    [   17.349220] failed to validate module [cfg80211] BTF: -22
    [   17.472070] kmodloader: 3 modules could not be probed
    [   17.473133] kmodloader: - cfg80211 - 0
    [   17.473762] kmodloader: dependency not loaded cfg80211
    [   17.474421] kmodloader: - mac80211 - 1
    [   17.474988] kmodloader: dependency not loaded mac80211
    [   17.475632] kmodloader: dependency not loaded cfg80211
    [   17.476263] kmodloader: - mac80211_hwsim - 2

    root@OpenWrt:/usr/libexec/kselftests-bpf# insmod bpf_testmod.ko
    [ 4735.776792] missing module BTF, cannot register kfuncs
    [ 4735.777371] missing module BTF, cannot register kfuncs
    [ 4735.777955] missing module BTF, cannot register kfuncs
    [ 4735.778452] missing module BTF, cannot register kfuncs

Release Notes: https://lore.kernel.org/bpf/ZmjBHWw-Q5hKBiwA@x1/

Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
Link: https://github.com/openwrt/openwrt/pull/15697
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>