scripts: do not allow commas in directories, it breaks things

The comma is used by the autotools as separator in many sed expressions,
which break if a directory contains commas.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

reporter_name="Yann Diorcet <diorcet.yann@gmail.com>"

reporter_url=""

reporter_comment="Config to build cross-compiler with mingw as kernel type for

64 bits Windows target"