whoami need to escape the backslash in 'pc\user' otherwise src/version.c can't compile.
Signed-off-by: Rafaël Carré <funman@videolan.org>
(cherry picked from commit 126d1ccc2c3d3faf6ec8e2bf53bae73273025098)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>