fix cmake for taglib 1.10

We have to use VERSION_LESS, rather than STRLESS.
Otherwise we get this error message:
- TagLib version too old: version searched :1.6, found 1.10

cmake/modules/FindTaglib.cmake

@@ -29,10 +29,10 @@ if(TAGLIBCONFIG_EXECUTABLE)
 
   exec_program(${TAGLIBCONFIG_EXECUTABLE} ARGS --version RETURN_VALUE _return_VALUE OUTPUT_VARIABLE TAGLIB_VERSION)
 
-  if(TAGLIB_VERSION STRLESS "${TAGLIB_MIN_VERSION}")
+  if(TAGLIB_VERSION VERSION_LESS "${TAGLIB_MIN_VERSION}")
      message(STATUS "TagLib version too old: version searched :${TAGLIB_MIN_VERSION}, found ${TAGLIB_VERSION}")
      set(TAGLIB_FOUND FALSE)
-  else(TAGLIB_VERSION STRLESS "${TAGLIB_MIN_VERSION}")
+  else(TAGLIB_VERSION VERSION_LESS "${TAGLIB_MIN_VERSION}")
 
      exec_program(${TAGLIBCONFIG_EXECUTABLE} ARGS --libs RETURN_VALUE _return_VALUE OUTPUT_VARIABLE TAGLIB_LIBRARIES)
 
@@ -42,7 +42,7 @@ if(TAGLIBCONFIG_EXECUTABLE)
         set(TAGLIB_FOUND TRUE)
      endif(TAGLIB_LIBRARIES AND TAGLIB_CFLAGS)
      string(REGEX REPLACE " *-I" ";" TAGLIB_INCLUDES "${TAGLIB_CFLAGS}")
-  endif(TAGLIB_VERSION STRLESS "${TAGLIB_MIN_VERSION}") 
+  endif(TAGLIB_VERSION VERSION_LESS "${TAGLIB_MIN_VERSION}")
   mark_as_advanced(TAGLIB_CFLAGS TAGLIB_LIBRARIES TAGLIB_INCLUDES)
 
 else(TAGLIBCONFIG_EXECUTABLE)