gdbsupport: Let construct_inferior_arguments take gdb::array_view param

Adapt the construct_inferior_arguments function to
take a gdb::array_view<char * const> parameter instead
of a char * array and an int indicating the length
and adapt the only call site.

This will allow calling it more simply in a follow-up
patch introducing more uses of the function.

gdbsupport/ChangeLog:

	* common-inferior.cc, common-inferior.h (construct_inferior_arguments):
	Adapt to take a gdb::array_view<char * const> parameter.
	Adapt call site.

Change-Id: I1c6496c8c0b0eb3ef3fda96e9e3bd64c5e6cac3c