tools: delete gtraceview and gtracestat

There has not been any substantial update to them since 2011. My quick
check shows that they don't work.

Just delete them. It would be easy to resurrect them from git log should
people still need them.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>

.gitignore

@@ -193,8 +193,6 @@ tools/misc/xen-livepatch
 tools/misc/xenperf
 tools/misc/xenpm
 tools/misc/xen-hvmctx
-tools/misc/gtraceview
-tools/misc/gtracestat
 tools/misc/xenlockprof
 tools/misc/lowmemd
 tools/misc/xencov