Make some improvements to how SORT_* specifiers and EXCLUDE_FILE specifiers are handl...

Make some improvements to how SORT_* specifiers and EXCLUDE_FILE specifiers are handled in the linker script grammar.

	* ldgram.y (ldgram_had_keep): Make static.
	(ldgram_vers_current_lang): Likewise.
	(filename_spec): New rule.
	(input_section_spec_no_keep): Use filename_spec.
	(wildcard_maybe_exclude): New rule.
	(wildcard_spec): Rename to...
	(section_name_spec): ...this.
	(section_NAME_list): Rename to...
	(section_name_list): ...this.
	(section_name_spec): Simplifiy and use wildcard_maybe_exclude.
	* ldlang.c (placed_commons): Delete.
	(lang_add_wild): No longer set placed_commons.
	(print_wild_statement): Use full names for SORT specifiers.
	* testsuite/ld-scripts/align.exp: Run new tests.
	* testsuite/ld-scripts/align3.d: New file.
	* testsuite/ld-scripts/align3.t: New file.
	* testsuite/ld-scripts/align4.d: New file.
	* testsuite/ld-scripts/align4.t: New file.
	* testsuite/ld-scripts/align5.d: New file.
	* testsuite/ld-scripts/align5.t: New file.
	* testsuite/ld-scripts/exclude-file-5.d: New file.
	* testsuite/ld-scripts/exclude-file-5.map: New file.
	* testsuite/ld-scripts/exclude-file-5.t: New file.
	* testsuite/ld-scripts/exclude-file-6.d: New file.
	* testsuite/ld-scripts/exclude-file-6.map: New file.
	* testsuite/ld-scripts/exclude-file-6.t: New file.
	* NEWS: Mention the changes.