FindHSPELL: set HSPELL_VERSION_STRING

This variable was documented, but never set.

Modules/FindHSPELL.cmake

@@ -32,12 +32,15 @@ IF (HSPELL_INCLUDE_DIR)
     FILE(READ "${HSPELL_INCLUDE_DIR}/hspell.h" HSPELL_H)
     STRING(REGEX REPLACE ".*#define HSPELL_VERSION_MAJOR ([0-9]+).*" "\\1" HSPELL_VERSION_MAJOR "${HSPELL_H}")
     STRING(REGEX REPLACE ".*#define HSPELL_VERSION_MINOR ([0-9]+).*" "\\1" HSPELL_VERSION_MINOR "${HSPELL_H}")
+    SET(HSPELL_VERSION_STRING "${HSPELL_VERSION_MAJOR}.${HSPELL_VERSION_MINOR}")
 ENDIF()
 
 # handle the QUIETLY and REQUIRED arguments and set HSPELL_FOUND to TRUE if 
 # all listed variables are TRUE
 INCLUDE(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
-FIND_PACKAGE_HANDLE_STANDARD_ARGS(HSPELL DEFAULT_MSG HSPELL_LIBRARIES HSPELL_INCLUDE_DIR)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(HSPELL
+                                  REQUIRED_VARS HSPELL_LIBRARIES HSPELL_INCLUDE_DIR
+                                  VERSION_VAR HSPELL_VERSION_STRING)
 
 MARK_AS_ADVANCED(HSPELL_INCLUDE_DIR HSPELL_LIBRARIES)