Patch to implement set remote hardware-watchpoint-length-limit

[Philippe Waroquiers]

This patch allows to set the limit of the length of hardware watchpoints.
This allows a.o. unlimited "simulated hardware" watchpoints 
with a gdbserver embedded in Valgrind. See 
http://bugs.kde.org/show_bug.cgi?id=214909

Philippe
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