Small binary_history_fix

[matthiasfabry]

Akin to star/history.f90, this stop the warning that user-defined columns are not being found when fetching data for pgbinary

[warrickball]

For anyone looking for the equivalent code in star, see e.g.

mesa/star/private/history.f90

Lines 3145 to 3154 in 5ce4f75

	subroutine get_history_specs(s, num, names, specs, report)
	use utils_lib
	use utils_def
	type (star_info), pointer :: s
	integer, intent(in) :: num
	character (len = *), intent(in) :: names(:)
	integer, intent(out) :: specs(:)
	logical, intent(in) :: report

[pmocz]

@matthiasfabry, you may merge in when ready!