libunwind: add ppc64 support

Backport an upstream patch to make libunwind build on ppc64, and add
powerpc64 to the dependencies.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Acked-by: Rui Salvaterra <rsalvaterra@gmail.com>

package/libs/libunwind/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libunwind
 PKG_VERSION:=1.5.0
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=@SAVANNAH/$(PKG_NAME)
@@ -32,7 +32,7 @@ define Package/libunwind
   CATEGORY:=Libraries
   TITLE:=The libunwind project
   URL:=http://www.nongnu.org/libunwind/
-  DEPENDS:=@((mips||mipsel||mips64||x86_64||arm||aarch64)||(USE_GLIBC&&(powerpc||i386))) +zlib
+  DEPENDS:=@((mips||mipsel||mips64||powerpc64||x86_64||arm||aarch64)||(USE_GLIBC&&(powerpc||i386))) +zlib
   ABI_VERSION:=8
 endef
 

package/libs/libunwind/patches/001-Don-t-force-exec_prefix-lib64-libdir-on-ppc64.patch

+From 0af7e7a53480ce8e1cf6cfb4e9fe071c1185ef31 Mon Sep 17 00:00:00 2001
+From: Matthias Diener <matthias.diener@gmail.com>
+Date: Fri, 2 Jul 2021 12:36:10 -0500
+Subject: [PATCH] Don't force {exec_prefix}/lib64 libdir on ppc64
+
+---
+ configure.ac | 6 ------
+ 1 file changed, 6 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index 9fadc163..0dec4ca6 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -215,12 +215,6 @@ fi
+ AM_CONDITIONAL(USE_DWARF, [test x$use_dwarf = xyes])
+ AC_MSG_RESULT([$use_dwarf])
+ 
+-if test x$target_arch = xppc64; then
+-        libdir='${exec_prefix}/lib64'
+-        AC_MSG_NOTICE([PowerPC64 detected, lib will be installed ${libdir}]);
+-        AC_SUBST([libdir])
+-fi
+-
+ AC_MSG_CHECKING([whether to restrict build to remote support])
+ if test x$target_arch != x$host_arch; then
+   CPPFLAGS="${CPPFLAGS} -DUNW_REMOTE_ONLY"
+-- 
+2.32.0
+