[Ada] VxWorks inconsistent use of return type Fixup

[Ada] VxWorks inconsistent use of return type Fixup

gcc/ada/

	* libgnarl/s-osinte__vxworks.ads (tlsKeyCreate): Return int.
	* libgnarl/s-tpopsp__vxworks-rtp.adb (ERROR): Declare from
	System.VxWorks.Ext.ERROR.
	(Initialize): Declare IERR. Assert it.
	* libgnarl/s-tpopsp__vxworks.adb (ERROR): Declare from
	System.VxWorks.Ext.ERROR.
	(Is_Valid_Task): Declare IERR. Test return.
	* libgnarl/s-vxwext__kernel.adb (semDelete): Return STATUS.