edits for BPY_extern.h functions, no functional changes

- remove unused code.
- BPY_run_python_script() split in 2, BPY_filepath_exec, BPY_text_exec
- renamed funcs.

source/blender/python/intern/stubs.c

@@ -27,11 +27,10 @@
  */
 
 /* python, will come back */
-//void BPY_run_python_script(void) {}
-//void BPY_start_python(void) {}
-void BPY_call_importloader(const char *filepath) {(void)filepath;}
-//void BPY_free_compiled_text(void) {}
-void BPY_pyconstraint_eval(void) {}
+//void BPY_script_exec(void) {}
+//void BPY_python_start(void) {}
+//void BPY_text_free_code(void) {}
+void BPY_pyconstraint_exec(void) {}
 void BPY_pyconstraint_target(void) {}
 int BPY_is_pyconstraint(void) {return 0;}
 void BPY_pyconstraint_update(void) {}