scons: Include flags required to link statically with Python

Python requires the flags in LINKFORSHARED to be added the linker
flags when linking with a statically with Python. Failing to do so
typically results in errors from the Python's dynamic module loader at
start up.

SConstruct

@@ -839,6 +839,8 @@ py_lib_path = [ py_getvar('LIBDIR') ]
 # shared library in prefix/lib/.
 if not py_getvar('Py_ENABLE_SHARED'):
     py_lib_path.append(py_getvar('LIBPL'))
+    # Python sometimes needs special flags when linking statically.
+    main.Append(LINKFLAGS=[py_getvar('LINKFORSHARED').split()])
 
 py_libs = []
 for lib in py_getvar('LIBS').split() + py_getvar('SYSLIBS').split():