Fix incompatible API on AIX with random_r and initstate_r

https://bugs.freedesktop.org/show_bug.cgi?id=74603

src/fccompat.c

@@ -170,14 +170,27 @@ FcRandom(void)
     static struct random_data fcrandbuf;
     static char statebuf[256];
     static FcBool initialized = FcFalse;
+#ifdef _AIX
+    static char *retval;
+    long res;
+#endif
 
     if (initialized != FcTrue)
     {
+#ifdef _AIX
+	initstate_r (time (NULL), statebuf, 256, &retval, &fcrandbuf);
+#else
 	initstate_r (time (NULL), statebuf, 256, &fcrandbuf);
+#endif
 	initialized = FcTrue;
     }
 
+#ifdef _AIX
+    random_r (&res, &fcrandbuf);
+    result = (int32_t)res;
+#else
     random_r (&fcrandbuf, &result);
+#endif
 #elif HAVE_RANDOM
     static char statebuf[256];
     char *state;