Fix SystemError for PY_SSIZE_T_CLEAN in fastlz.decompress

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "fastlz"]
+	path = fastlz
+	url = https://github.com/ariya/FastLZ.git

fastlz.c

@@ -1,3 +1,4 @@
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include "fastlz/fastlz.h"
 
@@ -16,7 +17,8 @@ compress(PyObject *self, PyObject *args, PyObject *kwargs)
     PyObject *result;
     const char *input;
     char *output;
-    int level = 0, input_len, output_len;
+    Py_ssize_t level = 0, input_len; 
+    uint32_t output_len;
 
     static char *arglist[] = {"string", "level", NULL};
     if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s#|i", arglist, &input,
@@ -62,14 +64,14 @@ decompress(PyObject *self, PyObject *args)
 {
     PyObject *result;
     const char *input;
-    int input_len;
+    Py_ssize_t input_len;
     char *output;
     uint32_t output_len, decompressed_len;
 
     if (!PyArg_ParseTuple(args, "s#", &input, &input_len))
         return NULL;
 
-    if ((uint32_t)input_len < sizeof(uint32_t)) {
+    if (input_len < (Py_ssize_t)sizeof(uint32_t)) {
         PyErr_SetString(FastlzError, "invalid input");
         return NULL;
     }