CMake: Add OMIT_VERSION_SUFFIX option

On iOS, it's far easier to not include the version in the file name. It won't matter there because all libraries must be included in the app bundle anyway.

cmake/macros/Versioning.cmake

@@ -12,7 +12,7 @@ function(add_library target_name)
   _add_library("${target_name}" ${ARGN})
 
   get_target_property(type "${target_name}" TYPE)
-  if(type STREQUAL "SHARED_LIBRARY")
+  if(type STREQUAL "SHARED_LIBRARY" AND NOT OMIT_VERSION_SUFFIX)
     set_target_properties("${target_name}" PROPERTIES
       VERSION "${PROJECT_VERSION}"
       SOVERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}")