Dwarf: Don't add nameless modules to partial symbol table (ChangeLogs)

Add missing ChangeLog entries for previous commit.

gdb/ChangeLog:
2019-06-11  Bernhard Heckel  <bernhard.heckel@intel.com>

	* dwarf2read.c (add_partial_symbol): Skip nameless modules.

gdb/testsuite/Changelog:
2019-06-11  Bernhard Heckel  <bernhard.heckel@intel.com>

	* gdb.fortran/block-data.f: New.
	* gdb.fortran/block-data.exp: New.