Within the compiler, module keywords "import", "module", and "export" that
are recognized as part of module directives gain an extra trailing space to
distinguish them from other non-keyword uses of those words in the code.
But when dumping preprocessed output, printing those spaces creates a
gratuitous inconsistency with non-modules preprocessing, as revealed by
several of the g++.dg/modules/cpp* tests if modules are enabled by default
in C++20 mode.

libcpp/ChangeLog:

	* lex.cc (cpp_output_token): Omit terminal space from name.

gcc/testsuite/ChangeLog:

	* g++.dg/modules/cpp-2_c.C: Expect only one space after import.
	* g++.dg/modules/cpp-5_c.C
	* g++.dg/modules/dep-2.C
	* g++.dg/modules/dir-only-2_b.C
	* g++.dg/modules/pr99050_b.C
	* g++.dg/modules/inc-xlate-1_b.H
	* g++.dg/modules/legacy-3_b.H
	* g++.dg/modules/legacy-3_c.H: Likewise.