Fix signedness of various char variables to stop causing a warning under gcc 4.
diff --git a/Python/compile.c b/Python/compile.c
index 5781b21..476dbe6 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -662,7 +662,7 @@
/* Bypass optimization when the lineno table is too complex */
assert(PyString_Check(lineno_obj));
- lineno = PyString_AS_STRING(lineno_obj);
+ lineno = (unsigned char*)PyString_AS_STRING(lineno_obj);
tabsiz = PyString_GET_SIZE(lineno_obj);
if (memchr(lineno, 255, tabsiz) != NULL)
goto exitUnchanged;