fixing warning reported by autoconf due to missing [ ] around AC_LANG_PROGRAM
updating autoconf version requirement
addressing problem of used cp option that do not exist under BSD systems
based on patch provided by Jan Gosmann
updating French translated messages
getting ready for release 2.4.12
fixed syntax error in testing tool's Makefile.am
adding initialization value for two variable to avoid unappropriate warning when compiling with -Wall option
Merge commit 'aa456466e8997970b069f079cc9b16f797d360c6' into branch_2.4.x_cmake+lz4

* commit 'aa456466e8997970b069f079cc9b16f797d360c6':
  adding initialization value for two variable to avoid unappropriate warning when compiling with -Wall option
  fixed syntax error in testing tool's Makefile.am
  getting ready for release 2.4.12
  updating French translated messages
  addressing problem of used cp option that do not exist under BSD systems based on patch provided by Jan Gosmann
  updating autoconf version requirement
  fixing warning reported by autoconf due to missing [ ] around AC_LANG_PROGRAM