win32: use _pipe() when _CRT_USE_WINAPI_FAMILY_DESKTOP_APP is defined

This is how it's enabled in the Platform SDK and mingw-w64 since
44e8e712a40bce1dbc76ada2c01b9326f17cb979 (mingw-w64 v8+)

src/win32/filesystem.c

@@ -415,11 +415,19 @@ int vlc_dup2(int oldfd, int newfd)
 
 int vlc_pipe (int fds[2])
 {
-#ifdef VLC_WINSTORE_APP
+#if (defined(__MINGW64_VERSION_MAJOR) && __MINGW64_VERSION_MAJOR < 8)
+    // old mingw doesn't know about _CRT_USE_WINAPI_FAMILY_DESKTOP_APP
+# if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+    return _pipe (fds, 32768, O_NOINHERIT | O_BINARY);
+# else
     _set_errno(EPERM);
     return -1;
-#else
+# endif
+#elif defined(_CRT_USE_WINAPI_FAMILY_DESKTOP_APP)
     return _pipe (fds, 32768, O_NOINHERIT | O_BINARY);
+#else
+    _set_errno(EPERM);
+    return -1;
 #endif
 }