zippy: Re-release snappy 1.1.5 as 1.1.6.

The migration from autotools to CMake in 1.1.5 wasn't as smooth as
intended. The SONAME / SOVERSION were broken in both build systems,
causing breakages in systems that upgraded from snappy 1.1.4 to 1.1.5,
as reported in Homebrew/homebrew-core#15274
and #45.

CMakeLists.txt

@@ -1,5 +1,5 @@
 CMAKE_MINIMUM_REQUIRED(VERSION 3.1)
-PROJECT(Snappy VERSION 1.1.5 LANGUAGES C CXX)
+PROJECT(Snappy VERSION 1.1.6 LANGUAGES C CXX)
 
 SET(CMAKE_INCLUDE_CURRENT_DIR ON)
 
@@ -107,7 +107,8 @@ INSTALL(TARGETS snappy
         ARCHIVE DESTINATION lib)
 INSTALL(EXPORT SnappyTargets NAMESPACE Snappy:: DESTINATION lib/cmake/Snappy)
 
-SET_TARGET_PROPERTIES(snappy PROPERTIES SOVERSION ${PROJECT_VERSION})
+SET_TARGET_PROPERTIES(snappy PROPERTIES VERSION ${PROJECT_VERSION}
+                      SOVERSION ${PROJECT_VERSION_MAJOR})
 
 SET(INCLUDE_INSTALL_DIR include)
 SET(LIBRARY_INSTALL_DIR lib)

NEWS

@@ -1,5 +1,16 @@
+Snappy v1.1.6, July 12th 2017:
+
+This is a re-release of v1.1.5 with proper SONAME / SOVERSION values.
+
 Snappy v1.1.5, June 28th 2017:
 
+This release has broken SONAME / SOVERSION values. Users of snappy as a shared
+library should avoid 1.1.5 and use 1.1.6 instead. SONAME / SOVERSION errors will
+manifest as the dynamic library loader complaining that it cannot find snappy's
+shared library file (libsnappy.so / libsnappy.dylib), or that the library it
+found does not have the required version. 1.1.6 has the same code as 1.1.5, but
+carries build configuration fixes for the issues above.
+
   * Add CMake build support. The autoconf build support is now deprecated, and
     will be removed in the next release.
 

configure.ac

@@ -1,11 +1,11 @@
 m4_define([snappy_major], [1])
 m4_define([snappy_minor], [1])
-m4_define([snappy_patchlevel], [5])
+m4_define([snappy_patchlevel], [6])
 
 # Libtool shared library interface versions (current:revision:age)
 # Update this value for every release!  (A:B:C will map to foo.so.(A-C).C.B)
 # http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
-m4_define([snappy_ltversion], [4:1:4])
+m4_define([snappy_ltversion], [2:6:1])
 
 AC_INIT([snappy], [snappy_major.snappy_minor.snappy_patchlevel])
 AC_CONFIG_MACRO_DIR([m4])