Update META version.

META

@@ -1,4 +1,4 @@
-version = "0.5.0"
+version = "0.5.1"
 description = "Combinators for binding to C libraries without writing any C."
 requires = "unix bigarray str bytes"
 archive(byte) = "ctypes.cma"
@@ -8,7 +8,7 @@ archive(native, plugin) = "ctypes.cmxs"
 exists_if = "ctypes.cma"
 
 package "top" (
-  version = "0.5.0"
+  version = "0.5.1"
   description = "Toplevel printers for C types"
   requires = "ctypes"
   archive(byte) = "ctypes-top.cma"
@@ -19,7 +19,7 @@ package "top" (
 )
 
 package "stubs" (
-  version = "0.5.0"
+  version = "0.5.1"
   description = "Stub generation from C types"
   requires = "ctypes"
   archive(byte) = "cstubs.cma"
@@ -31,13 +31,13 @@ package "stubs" (
 )
 
 package "foreign" (
- version = "0.5.0"
+ version = "0.5.1"
  description = "Dynamic linking of C functions"
  requires(-mt) = "ctypes.foreign.unthreaded"
  requires(mt) = "ctypes.foreign.threaded"
 
  package "base" (
-  version = "0.5.0"
+  version = "0.5.1"
   description = "Dynamic linking of C functions (base package)"
   requires = "ctypes"
   archive(byte) = "ctypes-foreign-base.cma"
@@ -48,7 +48,7 @@ package "foreign" (
  )
 
  package "threaded" (
-  version = "0.5.0"
+  version = "0.5.1"
   description = "Dynamic linking of C functions (for use in threaded programs)"
   requires = "threads ctypes ctypes.foreign.base"
   archive(byte) = "ctypes-foreign-threaded.cma"
@@ -59,7 +59,7 @@ package "foreign" (
  )
 
  package "unthreaded" (
-  version = "0.5.0"
+  version = "0.5.1"
   description = "Dynamic linking of C functions (for use in unthreaded programs)"
   requires = "ctypes ctypes.foreign.base"
   archive(byte) = "ctypes-foreign-unthreaded.cma"