Simple build fixes for Visual Studio 2015 / WinRT

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• Don't define sock_t unless V7_ENABLE_SOCKET is enabled to work around #521
• Disable V7_ENABLE__File__list on WinRT because of #520
• Don't build the opendir/closedir/readdir reimplementations unless V7_ENABLE__File__list is enabled

diff --git a/v7/v7.c b/v7/v7.c
index 00a0031..ab0a335 100644
--- a/v7/v7.c
+++ b/v7/v7.c
@@ -570,7 +570,7 @@ int v7_get_stack_avail_lwm(struct v7 *v7);
 #define V7_ENABLE__Date__toJSON 1
 #define V7_ENABLE__Date__toLocaleString 1
 #define V7_ENABLE__Date__toString 1
-#define V7_ENABLE__File__list 1
+#define V7_ENABLE__File__list 0
 #define V7_ENABLE__Function__bind 1
 #define V7_ENABLE__Function__call 1
 #define V7_ENABLE__Math 1
@@ -1155,7 +1155,9 @@ typedef short int16_t;
 typedef unsigned short uint16_t;
 typedef __int64 int64_t;
 typedef unsigned __int64 uint64_t;
+#ifdef V7_ENABLE_SOCKET
 typedef SOCKET sock_t;
+#endif
 typedef uint32_t in_addr_t;
 #ifndef UINT16_MAX
 #define UINT16_MAX 65535
@@ -6274,6 +6276,7 @@ void to_wchar(const char *path, wchar_t *wbuf, size_t wbuf_len) {
  * All rights reserved
  */

+#if V7_ENABLE__File__list
 #ifndef EXCLUDE_COMMON

 /* Amalgamated: #include "osdep.h" */
@@ -6359,6 +6362,7 @@ struct dirent *readdir(DIR *dir) {
 #endif

 #endif /* EXCLUDE_COMMON */
+#endif /* V7_ENABLE__File__list */
 #ifdef V7_MODULE_LINES
 #line 1 "./src/../../common/ubjson.c"
 /**/

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523 is related to this.