Add a few more VxWorks targets.
Correct misspelled VXWORKS macros.
Add VXWORKS identifying macros to e_os2.h.
Add required inclusions and mappings for VxWorks in e_os.h.
A few small modifications to make OpenSSL build and work on VxWorks.
PR: 253, except for the  change that was handled in an earlier
         commit, and a request for easy build of just parts of OpenSSL.
diff --git a/e_os2.h b/e_os2.h
index ff68d5b..8db74f8 100644
--- a/e_os2.h
+++ b/e_os2.h
@@ -178,6 +178,11 @@
 # endif
 #endif
 
+/* ------------------------------- VxWorks --------------------------------- */
+#ifdef OPENSSL_SYSNAME_VXWORKS
+# define OPENSSL_SYS_VXWORKS
+#endif
+
 /**
  * That's it for OS-specific stuff
  *****************************************************************************/