configure: compile with vdo and writecache by default

Enable compilation of vdo and writecache support as internaly
supported segment types by default.

For disabling use:

--with-vdo=none
--with-writcache=none

WHATS_NEW

@@ -1,5 +1,6 @@
 Version 2.03.11 - 
 ==================================
+  Configure --with-vdo and --with-writecache as internal segments.
   Improving VDO man page examples.
   Switch code base to use flexible array syntax.
   Fix 64bit math when calculation cachevol size.

configure

@@ -9586,7 +9586,7 @@ $as_echo_n "checking whether to include vdo... " >&6; }
 if test "${with_vdo+set}" = set; then :
   withval=$with_vdo; VDO=$withval
 else
-  VDO="none"
+  VDO="internal"
 fi
 
 
@@ -9746,7 +9746,7 @@ $as_echo_n "checking whether to include writecache... " >&6; }
 if test "${with_writecache+set}" = set; then :
   withval=$with_writecache; WRITECACHE=$withval
 else
-  WRITECACHE="none"
+  WRITECACHE="internal"
 fi
 
 

configure.ac

@@ -607,7 +607,7 @@ AC_MSG_CHECKING(whether to include vdo)
 AC_ARG_WITH(vdo,
 	    AC_HELP_STRING([--with-vdo=TYPE],
 			   [vdo support: internal/none [internal]]),
-			   VDO=$withval, VDO="none")
+			   VDO=$withval, VDO="internal")
 
 AC_MSG_RESULT($VDO)
 
@@ -655,7 +655,7 @@ AC_MSG_CHECKING(whether to include writecache)
 AC_ARG_WITH(writecache,
 	    AC_HELP_STRING([--with-writecache=TYPE],
 			   [writecache support: internal/none [none]]),
-			   WRITECACHE=$withval, WRITECACHE="none")
+			   WRITECACHE=$withval, WRITECACHE="internal")
 
 AC_MSG_RESULT($WRITECACHE)