kernel-shark: Modify FreeSans warning msg for GUI

Make the warning point out that the FreeSans font is required for the
kernelshark GUI. This is to alert the user that the GUI will not be made
when cmake does not detect FreeSans.

Signed-off-by: Solomon Tan <wjsota@gmail.com>
Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
1 file changed