Fix cmake's version string handling (change proposed by Jonathan Perkin).

Before this, a text suffix (like "-rc") after the numeric version was needed.

cmake/mysql_version.cmake

@@ -42,6 +42,9 @@ MACRO(GET_MYSQL_VERSION)
         IF(NOT VERSION_STRING)
           FILE(STRINGS  configure.in  str REGEX "AC_INIT\\(")
           STRING(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+[-][a-zAZ0-9]+" VERSION_STRING "${str}")
+          IF(NOT VERSION_STRING)
+            STRING(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" VERSION_STRING "${str}")
+          ENDIF()
         ENDIF()
       ENDIF()
     ENDIF()