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[Ada] Handle VMS RMS keys in file I/O


VMS has a multitude of sophisticated file organizations, formats,
and attributes that are handled at the system service level (aka RMS)
Under some circumstances a file can be created that cannot be read
without the appropriate RMS key in the file open call. A mechanism is
designed for passing RMS keys and a minimal number are implemented.

Tested on x86_64-pc-linux-gnu, committed on trunk

2013-04-12  Doug Rupp  <rupp@adacore.com>

	* s-crtl.ads (fopen, freopen): Add vms_form parameter
	* i-cstrea.ads (fopen, freopen): Likewise.
	* adaint.h (__gnat_fopen, __gnat_freopen): Likewise.
	* adaint.c (__gnat_fopen, __gnat_freopen): Likewise.
	[VMS]: Split out RMS keys and call CRTL function appropriately.
	* s-fileio.adb (Form_VMS_RMS_Keys, Form_RMS_Context_Key): New
	subprograms.
	(Open, Reset): Call Form_VMS_RMS_Keys. Call fopen,freopen with
	vms_form
	* gnat_rm.texi: Document implemented RMS keys.

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