Adjust for OpenBSD-specific Tcl package path layout.

Index: tcl/init.tcl
--- tcl/init.tcl.orig
+++ tcl/init.tcl
@@ -30,10 +30,24 @@
 #
 
 # Make packages in that directory available
-eval lappend auto_path $eltcl_pkgPath
+set na {}
+foreach p $auto_path {
+	lappend na [file normalize $p]
+}
+foreach p $eltcl_pkgPath {
+	if {[set np [file normalize $p]] ni $na} {
+		lappend auto_path $p
+		lappend na $np
+	}
+}
 if { [info exists env(ELTCLLIBPATH)] } {
-    eval lappend auto_path $env(ELTCLLIBPATH)
+	foreach p $env(ELTCLLIBPATH) {
+		if {[file normalize $p] ni $na} {
+			lappend auto_path $p
+		}
+	}
 }
+unset na p np
 
 # Install default signal handlers (if the signal command exists)
 if { [info command signal] != "" } { namespace eval el {