VFS: Optionally disable the VFS implementation of select()

This allows to temporarily resolve issues like
https://github.com/espressif/esp-idf/issues/1987
while bugs are fixed in the VFS implementation of select().

components/lwip/Kconfig

@@ -37,6 +37,16 @@ config LWIP_MAX_SOCKETS
         the maximum amount of sockets here. The valid value is from 1
         to 16.
 
+config USE_ONLY_LWIP_SELECT
+    bool "Support LWIP socket select() only"
+    default n
+    help
+        The virtual filesystem layer of select() redirects sockets to
+        lwip_select() and non-socket file descriptors to their respective driver
+        implementations. If this option is enabled then all calls of select()
+        will be redirected to lwip_select(), therefore, select can be used
+        for sockets only.
+
 config LWIP_SO_REUSE
     bool "Enable SO_REUSEADDR option"
     default y