libsframe: bump version to 2.0

Remove LIBSFRAME_1.1, LIBSFRAME_1.0 nodes and add a new LIBSFRAME_2.0
node (non-inheritance version) to create new global versioned symbols.
Also announce libsframe.so.2 in NEWS.

New APIs:
     sframe_decoder_get_flags;
     sframe_decoder_get_offsetof_fde_start_addr;
     sframe_encoder_get_flags;
     sframe_encoder_get_offsetof_fde_start_addr;

Removed APIs: (already deprecated since X-2 release)
     sframe_get_funcdesc_with_addr;

APIs with changed semantics:
     sframe_decoder_get_funcdesc_v2;
     sframe_encoder_add_funcdesc_v2;
     sframe_encoder_write;

lisbframe/
	* libsframe.ver: Define new LIBSFRAME_2.0.
	* libtool-version: Bump the 'current' numeral to indicate a binary
	incompatible release.
include/
	* sframe-api.h (sframe_get_funcdesc_with_addr): Remove
	deprecated interface.
libsframe/
	* sframe.c (sframe_get_funcdesc_with_addr): Likewise.
binutils/
	* NEWS: Announce new versioned release of libsframe.

binutils/NEWS

@@ -1,5 +1,17 @@
 -*- text -*-
 
+* New versioned release of libsframe: libsframe.so.2.  This release introduces
+  versioned symbols with version node name LIBSFRAME_2.0.  Some new symbols
+  have been added to support the new flag SFRAME_F_FDE_FUNC_START_PCREL and
+  retrieving flags from SFrame decoder and encoder objects:
+    - Addition of sframe_decoder_get_flags,
+      sframe_decoder_get_offsetof_fde_start_addr, sframe_encoder_get_flags,
+      sframe_encoder_get_offsetof_fde_start_addr.
+  This release also includes backward-incompatible ABI changes:
+    - Removal of sframe_get_funcdesc_with_addr.
+    - Change in the behavior of sframe_decoder_get_funcdesc_v2,
+      sframe_encoder_add_funcdesc_v2 and sframe_encoder_write.
+
 * On s390 64-bit (s390x), gas, ld, objdump, and readelf now support generating
   and processing SFrame V2 stack trace information (.sframe).  The assembler
   generates SFrame info from CFI directives with option "--gsframe".  The