Make print-file-var.exp test attribute visibility hidden, dlopen, and main symbol

Make gdb.base/print-file-var.exp test all combinations of:

  - attribute hidden in the this_version_id symbols or not
  - dlopen or not
  - this_version_id symbol in main file or not
  - C++

gdb/testsuite/ChangeLog
2019-10-02  Pedro Alves  <palves@redhat.com>
	    Andrew Burgess  <andrew.burgess@embecosm.com>

	* gdb.base/print-file-var-lib1.c: Include <stdio.h> and
	"print-file-var.h".
	(this_version_id) Use ATTRIBUTE_VISIBILITY.
	(get_version_1): Print this_version_id and its address.
	Add extern "C" wrappers around interface functions.
	* gdb.base/print-file-var-lib2.c: Include <stdio.h> and
	"print-file-var.h".
	(this_version_id) Use ATTRIBUTE_VISIBILITY.
	(get_version_2): Print this_version_id and its address.
	Add extern "C" wrappers around interface functions.
	* gdb.base/print-file-var-main.c: Include <dlfcn.h>, <assert.h>,
	<stddef.h> and "print-file-var.h".
	Add extern "C" wrappers around interface functions.
	[VERSION_ID_MAIN] (this_version_id): Define.
	(main): Define v0.  Use dlopen if SHLIB_NAME is defined.
	* gdb.base/print-file-var.h: Add some #defines to simplify setting
	up extern "C" blocks.
	* gdb.base/print-file-var.exp (test): New, factored out from top
	level.
	(top level): Test all combinations of attribute hidden or not,
	dlopen or not, and this_version_id symbol in main file or not.
	Compile tests as both C++ and C, make test names unique.

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