Fortran: Enable setting breakpoint on nested functions.

Like in Ada, we want to be able to set a breakpoint on
nested functions, called "contained routines" in Fortran.

2016-06-30  Bernhard Heckel  <bernhard.heckel@intel.com>

gdb/Changelog:
	* dwarf2read.c (todo)

gdb/Changelog:
	* gdb.fortran/nested-funcs.exp: Set breakpoint on contained routines.

Change-Id: I7f2897f8f3160c0d5618850273d87579cc2479c8