PR ada/864
	* osint.ads, osint.adb (Program_Name): New parameter "Prog" to
	allow recognition of program suffix in addition to prefix.
	
	* gnatchop.adb (Locate_Executable): Add support for prefix.
	
	* make.adb, gnatcmd.adb, gnatlink.adb, prj-makr.adb,
	mlib-utl.adb: Adjust calls to Program_Name.

From-SVN: r136149