Support scanning of build-time GC roots in gengtype

Currently gengtype supports scanning target-specific files for GC roots,
but those files must exist in the source tree.  This patch extends the
support to include header files generated into the build directory.  It
also allows targets to specify build dependencies for s-gtype to ensure
the built headers are up to date prior to running gengtype.

2021-06-15  Bill Schmidt  <wschmidt@linux.ibm.com>

gcc/
	* Makefile.in (EXTRA_GTYPE_DEPS): New variable.
	(s-gtype): Depend on EXTRA_GTYPE_DEPS.
	* gengtype-state.c (state_writer::write_state_file_list): Add a
	parameter to the fileslist expression for the number of build
	headers to scan.
	(read_state_files_list): Detect build headers and strip the
	initial "./" or ".\" from their names.
	* gengtype.c (build_headers): New global variable.
	(num_build_headers): Likewise.
	(open_base_files): Emit #include for each build header.
	(main): Detect and count build headers.
	* gengtype.h (build_headers): New extern variable.
	(num_build_headers): Likewise.

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