typo in french error message

[Boris Mansencal]

Hi,

There is a typo in french translation of error messages (at least in 4.0 
release and in 4.1 snapshot of 05/05/15).

It affects gcc/po/fr.po and libcpp/po/fr.po :
"sasn effet" should be "sans effet"
"sasn lien" should be "sans lien"
(The word "sasn" does not exist in french language).

Regards,

Boris.