PHPC-285: Fix syntax for empty struct initializer

While "{ 0 }" should be sufficient, gcc's missing-braces warning requires that an extra pair of braces be used.

See: http://stackoverflow.com/q/11551986 and http://stackoverflow.com/a/20405554

Author: jmikola

php_bson.h

@@ -71,7 +71,7 @@ typedef struct {
 } php_phongo_bson_state;
 
 #if PHP_VERSION_ID >= 70000
-#define PHONGO_BSON_STATE_INITIALIZER  { {}, { PHONGO_TYPEMAP_NONE, NULL, PHONGO_TYPEMAP_NONE, NULL, PHONGO_TYPEMAP_NONE, NULL}, NULL}
+#define PHONGO_BSON_STATE_INITIALIZER  { {{ 0 }}, { PHONGO_TYPEMAP_NONE, NULL, PHONGO_TYPEMAP_NONE, NULL, PHONGO_TYPEMAP_NONE, NULL}, NULL}
 #else
 #define PHONGO_BSON_STATE_INITIALIZER  { NULL, { PHONGO_TYPEMAP_NONE, NULL, PHONGO_TYPEMAP_NONE, NULL, PHONGO_TYPEMAP_NONE, NULL}, NULL}
 #endif