Include Python/system paths in "buildenv" test output to help with debugging search path problems.

tests/compile/buildenv.pyx

@@ -107,6 +107,15 @@ SIZEOF_VOID_P  {SIZEOF_VOID_P}  ({sizeof(void*)})
 SIZEOF_UINTPTR_T  {SIZEOF_UINTPTR_T}  ({sizeof(unsigned int *)})
 SIZEOF_OFF_T  {SIZEOF_OFF_T}
 
+Paths:
+sys.executable = {sys.executable}
+sys.exec_prefix = {sys.exec_prefix}
+sys.base_exec_prefix = {sys.base_exec_prefix}
+sys.prefix = {sys.prefix}
+sys.path = {sys.path}
+PYTHONPATH (env) = {get_env('PYTHONPATH', '')}
+PYTHONHOME (env) = {get_env('PYTHONHOME', '')}
+
 Distutils:
 INCDIR = {sysconfig.get_python_inc()}
 LIBS = {config_var('LIBS')}