Rename ctx_version to abi_version in HPy LLVM context

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/hpy/HPyContextMember.java

@@ -87,7 +87,7 @@
 public enum HPyContextMember implements HPyUpcall {
     NAME("name"),
     PRIVATE("_private"),
-    CTX_VERSION("ctx_version"),
+    ABI_VERSION("abi_version"),
 
     // {{start ctx members}}
     // @formatter:off

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/hpy/llvm/GraalHPyLLVMContext.java

@@ -466,7 +466,8 @@ private Object[] createMembers(TruffleString name) {
         Object[] members = new Object[HPyContextMember.VALUES.length];
 
         members[HPyContextMember.NAME.ordinal()] = new CStringWrapper(name);
-        members[HPyContextMember.CTX_VERSION.ordinal()] = 1;
+        // TODO(fa): we should use the value of macro HPY_ABI_VERSION here
+        members[HPyContextMember.ABI_VERSION.ordinal()] = 0;
 
         // {{start llvm ctx init}}
         // @formatter:off