Add "ELFOSABI_NONE" which is the symbol used in a copy of the old ELF spec,

as an alias for "ELFOSABI_SYSV".

sys/sys/elf_common.h

@@ -85,6 +85,7 @@ typedef struct {
 
 /* Values for e_ident[EI_OSABI]. */
 #define ELFOSABI_SYSV		0	/* UNIX System V ABI */
+#define ELFOSABI_NONE		ELFOSABI_SYSV	/* symbol used in old spec */
 #define ELFOSABI_HPUX		1	/* HP-UX operating system */
 #define ELFOSABI_NETBSD		2	/* NetBSD */
 #define ELFOSABI_LINUX		3	/* GNU/Linux */