Issue python#110: Remove psyco support from Stackless 3.x

Psyco is dead and was never compatible with Python 3. This commit removes
the remains of the psyco support.

https://bitbucket.org/stackless-dev/stackless/issues/110

Author: Anselm Kruis

Stackless/changelog.txt

@@ -9,6 +9,9 @@ What's New in Stackless 3.X.X?
 
 *Release date: 20XX-XX-XX*
 
+- https://bitbucket.org/stackless-dev/stackless/issues/110
+  Remove the already non functional remains of psyco support.
+
 - https://bitbucket.org/stackless-dev/stackless/issues/109
   The Stackless python*.dll no longer exports private symbols. Symbols
   required by Stackless-aware 3rd party extension modules should still be

Stackless/core/stackless_impl.h

@@ -51,7 +51,6 @@ extern "C" {
 /* variables for the stackless protocol */
 PyAPI_DATA(int) slp_enable_softswitch;
 PyAPI_DATA(int) slp_try_stackless;
-PyAPI_DATA(int) slp_in_psyco;  /* required for compatibility with old extension modules */
 
 extern PyCStackObject * slp_cstack_chain;
 

Stackless/core/stacklesseval.c

@@ -23,11 +23,6 @@
 
 int slp_enable_softswitch = 1;
 
-/* compatibility mask for Psyco. It will be set to nonzero when
- * psyco-compiled code is run. Suppresses soft-switching.
- */
-int slp_in_psyco = 0;
-
 /*
  * flag whether the next call should try to be stackless.
  * The protocol is: This flag may be only set if the called