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>

tools/dwarves/Makefile

@@ -3,12 +3,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=dwarves
-PKG_VERSION:=1.26
+PKG_VERSION:=1.27
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=https://fedorapeople.org/~acme/dwarves/
-PKG_HASH:=1d8c9a1c2d42e06cc121a70a39c4f621fd28f15c476ed1b7c7b226f41fdd32df
+PKG_HASH:=ef7f21f1c6016896d03a01f05cab225151f9068e19cc8cddc6e754b2b5cbe279
 
 PKG_MAINTAINER:=Tony Ambardar <itugrok@yahoo.com>
 PKG_LICENSE:=GPL-2.0-only

tools/dwarves/patches/100-reproducible-builds.patch

@@ -0,0 +1,14 @@
+diff --git a/pahole.c b/pahole.c
+index 954498d..5f13a7a 100644
+--- a/pahole.c
++++ b/pahole.c
+@@ -3723,6 +3723,9 @@ int main(int argc, char *argv[])
+ 		goto out;
+ 	}
+
++	if (getenv("SOURCE_DATE_EPOCH"))
++		conf_load.reproducible_build = true;
++
+ 	if (dwarves__init()) {
+ 		fputs("pahole: insufficient memory\n", stderr);
+ 		goto out;