adaint.h, adaint.c (__gnat_file_length): Returns an __int64.

adaint.h, adaint.c (__gnat_file_length): Returns an __int64.

2014-08-01  Pascal Obry  <obry@adacore.com>

	* adaint.h, adaint.c (__gnat_file_length): Returns an __int64.
	(__gnat_named_file_length): Likewise.
	(__gnat_file_length_attr): Likewise.
	* a-direct.adb (C_Size): Use size_t as returned type.
	* osint.adb (File_Length): Adjust spec for Internal routine
	(returns size_t).
	* s-os_lib.adb (File_Length): Now returns a CRTL.size_t.
	(System.CRTL): With claused moved to spec.
	* s-os_lib.ads (System.CRTL): With clause moved to here.

From-SVN: r213412