Disable slam defense by default

Slam defense was broken for so long that it effectively defaulted
to false -- make that the actual default to avoid BC breakage.

Fixes #347.

php_apc.c

@@ -88,7 +88,7 @@ apc_sma_t apc_sma;
 static void php_apc_init_globals(zend_apcu_globals* apcu_globals)
 {
 	apcu_globals->initialized = 0;
-	apcu_globals->slam_defense = 1;
+	apcu_globals->slam_defense = 0;
 	apcu_globals->smart = 0;
 	apcu_globals->preload_path = NULL;
 	apcu_globals->coredump_unmap = 0;
@@ -147,7 +147,7 @@ STD_PHP_INI_ENTRY("apc.smart",          "0",    PHP_INI_SYSTEM, OnUpdateLong,
 STD_PHP_INI_ENTRY("apc.mmap_file_mask",  NULL,  PHP_INI_SYSTEM, OnUpdateString,            mmap_file_mask,   zend_apcu_globals, apcu_globals)
 #endif
 STD_PHP_INI_BOOLEAN("apc.enable_cli",   "0",    PHP_INI_SYSTEM, OnUpdateBool,              enable_cli,       zend_apcu_globals, apcu_globals)
-STD_PHP_INI_BOOLEAN("apc.slam_defense", "1",    PHP_INI_SYSTEM, OnUpdateBool,              slam_defense,     zend_apcu_globals, apcu_globals)
+STD_PHP_INI_BOOLEAN("apc.slam_defense", "0",    PHP_INI_SYSTEM, OnUpdateBool,              slam_defense,     zend_apcu_globals, apcu_globals)
 STD_PHP_INI_ENTRY("apc.preload_path", (char*)NULL,              PHP_INI_SYSTEM, OnUpdateString,       preload_path,  zend_apcu_globals, apcu_globals)
 STD_PHP_INI_BOOLEAN("apc.coredump_unmap", "0", PHP_INI_SYSTEM, OnUpdateBool, coredump_unmap, zend_apcu_globals, apcu_globals)
 STD_PHP_INI_BOOLEAN("apc.use_request_time", "1", PHP_INI_ALL, OnUpdateBool, use_request_time,  zend_apcu_globals, apcu_globals)