libunwind: initial version 1.1

The package Makefile was based on work at link [1] with the following
changes

 1. Disable minidebuginfo support thus no dependency on liblzma
 2. Add 2 patches for building against musl-libc and building with
    mips16 enabled
 3. Add LICENSE and DEPENDS info, etc.

[1] https://github.com/rpi-openwrt/rpi-packages/tree/master/libs/libunwind

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

package/libs/libunwind/Makefile

@@ -0,0 +1,53 @@
+#
+# Copyright (C) 2008-2013 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=libunwind
+PKG_VERSION:=1.1
+PKG_RELEASE:=1
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=http://download.savannah.gnu.org/releases/libunwind
+PKG_MD5SUM:=fb4ea2f6fbbe45bf032cd36e586883ce
+PKG_FIXUP:=autoreconf
+PKG_INSTALL:=1
+
+PKG_LICENSE:=X11
+PKG_LICENSE_FILES:=LICENSE
+
+PKG_MAINTAINER:=Yousong Zhou <yszhou4tech@gmail.com>
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/libunwind
+  SECTION:=libs
+  CATEGORY:=Libraries
+  TITLE:=The libunwind project
+  URL:=http://www.nongnu.org/libunwind/
+  DEPENDS:=@(mips||mipsel||powerpc||i386||x86_64)
+endef
+
+define Package/libunwind/description
+  Libunwind defines a portable and efficient C programming interface (API) to determine the call-chain of a program.
+endef
+
+CONFIGURE_ARGS += --enable-minidebuginfo=no
+
+define Package/libunwind/install
+	$(INSTALL_DIR) $(1)/usr/lib
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libunwin*.so* $(1)/usr/lib/
+endef
+
+define Build/InstallDev
+	$(INSTALL_DIR) $(1)/usr/include $(1)/usr/lib/pkgconfig
+	$(CP) $(PKG_INSTALL_DIR)/usr/include/*.h $(1)/usr/include
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libunwin*.so* $(1)/usr/lib
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/pkgconfig/* $(1)/usr/lib/pkgconfig/
+endef
+
+$(eval $(call BuildPackage,libunwind))

package/libs/libunwind/patches/001-disable-tests.patch

@@ -0,0 +1,22 @@
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -36,7 +36,7 @@
+ 
+ nodist_include_HEADERS = include/libunwind-common.h
+ 
+-SUBDIRS = src tests doc
++SUBDIRS = src doc
+ 
+ noinst_HEADERS = include/dwarf.h include/dwarf_i.h include/dwarf-eh.h	\
+ 	include/compiler.h include/libunwind_i.h include/mempool.h	\
+--- a/Makefile.in
++++ b/Makefile.in
+@@ -313,7 +313,7 @@
+ 	$(am__append_7) $(am__append_8) $(am__append_9) \
+ 	$(am__append_10)
+ nodist_include_HEADERS = include/libunwind-common.h
+-SUBDIRS = src tests doc
++SUBDIRS = src doc
+ noinst_HEADERS = include/dwarf.h include/dwarf_i.h include/dwarf-eh.h	\
+ 	include/compiler.h include/libunwind_i.h include/mempool.h	\
+ 	include/remote.h						\

package/libs/libunwind/patches/002-fix-building-getcontext_S.patch

@@ -0,0 +1,19 @@
+diff -uprN a/src/mips/getcontext.S b/src/mips/getcontext.S
+--- a/src/mips/getcontext.S	2012-10-06 12:54:38.000000000 +0800
++++ b/src/mips/getcontext.S	2016-06-08 13:35:25.033051679 +0800
+@@ -24,12 +24,12 @@ OF CONTRACT, TORT OR OTHERWISE, ARISING
+ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+ 
+ #include "offsets.h"
+-#include <endian.h>
+ 
+ 	.text
++	.set nomips16
+ 
+ #if _MIPS_SIM == _ABIO32
+-# if __BYTE_ORDER == __BIG_ENDIAN
++# if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+ #  define OFFSET 4
+ # else
+ #  define OFFSET 0
+

package/libs/libunwind/patches/003-fix-missing-ef_reg-defs-with-musl.patch

@@ -0,0 +1,47 @@
+diff -uprN a/include/libunwind-mips.h b/include/libunwind-mips.h
+--- a/include/libunwind-mips.h	2012-10-06 12:54:38.000000000 +0800
++++ b/include/libunwind-mips.h	2016-06-08 13:55:55.029436442 +0800
+@@ -111,6 +111,42 @@ typedef enum
+   }
+ mips_regnum_t;
+ 
++#ifndef __GLIBC__
++#include <sys/reg.h>
++
++/* musl as of 1.1.14 does not export these */
++#define EF_REG0			6
++#define EF_REG1			7
++#define EF_REG2			8
++#define EF_REG3			9
++#define EF_REG4			10
++#define EF_REG5			11
++#define EF_REG6			12
++#define EF_REG7			13
++#define EF_REG8			14
++#define EF_REG9			15
++#define EF_REG10		16
++#define EF_REG11		17
++#define EF_REG12		18
++#define EF_REG13		19
++#define EF_REG14		20
++#define EF_REG15		21
++#define EF_REG16		22
++#define EF_REG17		23
++#define EF_REG18		24
++#define EF_REG19		25
++#define EF_REG20		26
++#define EF_REG21		27
++#define EF_REG22		28
++#define EF_REG23		29
++#define EF_REG24		30
++#define EF_REG25		31
++#define EF_REG28		34
++#define EF_REG29		35
++#define EF_REG30		36
++#define EF_REG31		37
++#endif
++
+ typedef enum
+   {
+     UNW_MIPS_ABI_O32,
+