Get rid of VEC(probe_p)

Get rid of VEC(probe_p)

Replace the remaining usages of VEC(probe_p) with std::vector.

Regtested on the buildbot.

gdb/ChangeLog:

	* probe.h: Don't include gdb_vecs.h.
	(DEF_VEC_P (probe_p)): Remove.
	(find_probes_in_objfile): Return an std::vector.
	* probe.c (find_probes_in_objfile): Likewise.
	* breakpoint.c (breakpoint_objfile_data)
	<longjmp_probes>: Change type to std::vector.
	<exception_probes>: Likewise.
	(free_breakpoint_probes): Don't manually free vectors.
	(create_longjmp_master_breakpoint): Adjust.
	(create_exception_master_breakpoint): Adjust.
	* solib-svr4.c (svr4_create_probe_breakpoints): Change
	parameter type, adjust.
	(svr4_create_solib_event_breakpoints): Adjust.