perlasm/x86asm.pl: recognize elf-1 denoting old ELF platforms.

(Imported from upstream's ca88a1d439f72f124d0f23e2d130e56bbcbb93a9)
diff --git a/crypto/perlasm/x86asm.pl b/crypto/perlasm/x86asm.pl
index 7236bea..1c88483 100644
--- a/crypto/perlasm/x86asm.pl
+++ b/crypto/perlasm/x86asm.pl
@@ -249,6 +249,8 @@
     $elf=$cpp=$coff=$aout=$macosx=$win32=$netware=$mwerks=$android=0;
     if    (($type eq "elf"))
     {	$elf=1;			require "x86gas.pl";	}
+    elsif (($type eq "elf-1"))
+    {	$elf=-1;		require "x86gas.pl";	}
     elsif (($type eq "a\.out"))
     {	$aout=1;		require "x86gas.pl";	}
     elsif (($type eq "coff" or $type eq "gaswin"))