In particular -f and -s options may contains paths that can easily
exceed the (old) 128 bytes buffer.
Change-Id: Ifc198536549f50663e8e588519bb9ef75dcd172c
Signed-off-by: Cristian Maglie <c.maglie@bug.st>
Reviewed-on: http://openocd.zylin.com/2241
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>