[binutils-gdb] Use std::vector in reread_symbols

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 4c404b8be6b1d8759eed50366207fc0e2e47d2b1 ***

Author: Tom Tromey <tom@tromey.com>
Branch: master
Commit: 4c404b8be6b1d8759eed50366207fc0e2e47d2b1

Use std::vector in reread_symbols

This changes reread_symbols to use std::vector, removing a cleanup.

gdb/ChangeLog
2017-04-12  Tom Tromey  <tom@tromey.com>

	* symfile.c (objfilep): Remove typedef.
	(reread_symbols): Use a std::vector.