Bump version number to 2.30.52

Bump version number to 2.30.52 since _bfd_link_hide_symbol has been added
to bfd_target.

bfd/

	* version.m4: Bump version to 2.30.52
	* configure: Regenerated.

binutils/

	* configure: Regenerated.

gas/

	* configure: Regenerated.

gprof/

	* configure: Regenerated.

ld/

	* configure: Regenerated.

opcodes/

	* configure: Regenerated.