g-os_lib.ads, [...] (Set_Executable, [...]): New subprograms.

g-os_lib.ads, [...] (Set_Executable, [...]): New subprograms.

2004-10-26  Thomas Quinot  <quinot@act-europe.fr>

	* g-os_lib.ads, g-os_lib.adb (Set_Executable, Set_Writable,
	Set_Read_Only): New subprograms.
	These new routines allow the user to set or unset the Owner execute
	and Owner write permission flags on a file.

	* makegpr.adb, mlib.adb, mlib-prj.adb: Use
	GNAT.OS_Lib.Set_Executable instead of rolling our own.

From-SVN: r89654