Fix nearly all compilation warnings under Apple gcc-4.0.  Tested with OPT="-g
-Wall -Wstrict-prototypes -Werror" in both --with-pydebug mode and --without.
There's still a batch of non-prototype warnings in Xlib.h that I don't know how
to fix.
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index 4b0958a..643693e 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -667,7 +667,7 @@
 	char buf[2048];
 	char *vptr;
 	int len;
-	const unsigned char *p;
+	unsigned char *p;
 
 	if (certificate == NULL)
 		return peer_alt_names;
diff --git a/Modules/_struct.c b/Modules/_struct.c
index b8f1525..a7fce10 100644
--- a/Modules/_struct.c
+++ b/Modules/_struct.c
@@ -182,6 +182,7 @@
 
 /* Same, but handling unsigned long */
 
+#ifndef PY_STRUCT_OVERFLOW_MASKING
 static int
 get_ulong(PyObject *v, unsigned long *p)
 {
@@ -201,6 +202,7 @@
 	}
 	return 0;
 }
+#endif  /* PY_STRUCT_OVERFLOW_MASKING */
 
 #ifdef HAVE_LONG_LONG