PHPC-2477: BSON_HAVE_ARC4RANDOM_BUF is obsolete

Author: jmikola

config.w32

@@ -137,8 +137,7 @@ if (PHP_MONGODB != "no") {
     BSON_HAVE_TIMESPEC: 0,
     BSON_EXTRA_ALIGN: 0,
     BSON_HAVE_GMTIME_R: 0,
-    BSON_HAVE_RAND_R: 0,
-    BSON_HAVE_ARC4RANDOM_BUF: 0
+    BSON_HAVE_RAND_R: 0
   };
 
   mongodb_generate_header(

scripts/autotools/libbson/FindDependencies.m4

@@ -39,10 +39,6 @@ AC_CHECK_FUNC(gmtime_r, [AC_SUBST(BSON_HAVE_GMTIME_R, 1)])
 AC_SUBST(BSON_HAVE_RAND_R, 0)
 AC_CHECK_FUNC(rand_r, [AC_SUBST(BSON_HAVE_RAND_R, 1)])
 
-# Check for arc4random_buf()
-AC_SUBST(BSON_HAVE_ARC4RANDOM_BUF, 0)
-AC_CHECK_FUNC(arc4random_buf, [AC_SUBST(BSON_HAVE_ARC4RANDOM_BUF, 1)])
-
 # Check for pthreads. We might need to make this better to handle mingw,
 # but I actually think it is okay to just check for it even though we will
 # use win32 primatives.