seamonkey/mozilla: check if 'regxpcom' does exist before calling it (see note)

Note:

This fixed a build issue with firefox where it tried to call the non-existing
'regxpcom'.

www/seamonkey/mozilla-conf.in

@@ -2,7 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: package/.../seamonkey/mozilla-conf.in
-# Copyright (C) 2006 - 2007 The OpenSDE Project
+# Copyright (C) 2006 - 2010 The OpenSDE Project
 # Copyright (C) 2004 - 2006 The T2 SDE Project
 # Copyright (C) 1998 - 2004 Clifford Wolf
 #
@@ -95,7 +95,7 @@ EOF
 mozilla_register() {
 	echo "Run the component registration ..."
 	pushd $MOZILLA_FIVE_HOME
-	LD_LIBRARY_PATH=. ./regxpcom
+	[ -e ./regxpcom ] && LD_LIBRARY_PATH=. ./regxpcom
 	[ -e ./regchrome ] && LD_LIBRARY_PATH=. ./regchrome
 	popd
 }