gdb: don't include gdbsupport/array-view.h in defs.h

Nothing in defs.h actually uses this.  Everything that I (and the
buildbot) can compile still compiles, so I guess that all users of
array_view already include it one way or another.  Worst case, if this
causes some build failure, the fix will be one #include away.

Change-Id: I981be98b0653cc18c929d85e9afd8732332efd15
Approved-By: John Baldwin <jhb@FreeBSD.org>
1 file changed