samples: . accepts previous comment as-is

When updating a sample configuration with a comment, a dot '.'
in the new comment keeps the previous comment.

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

 reporter_name="dsreed on freenode/#crosstool-ng"

 reporter_url=""

 reporter_comment="Enables experimental support for VFP/NEON hardware floating point."