Disable WPA entrprise on ESP8266 by default

CL: wifi: Disable WPA entrprise on ESP8266 by default.
    It's not viable anyway due to huge memory usage and is also buggy (crashes).
    If you really want it, re-enable with MGOS_ESP8266_WIFI_ENABLE_WPAENT cdef,
    otherwise enjoy extra 60K of space.

mos.yml

@@ -59,6 +59,11 @@ config_schema:
 build_vars:
   MGOS_WIFI_ENABLE_AP_STA: 0
 
+cdefs:
+  # WPA enterprise does not work properly on ESP8266 anyway due to lack of resources.
+  # But if you insist, you can override this to 1.
+  MGOS_ESP8266_WIFI_ENABLE_WPAENT: 0
+
 conds:
   - when: mos.platform == "cc3200"
     apply:

src/esp8266/esp_wifi.c

@@ -23,8 +23,10 @@
 #include <esp_common.h>
 #else
 #include <user_interface.h>
+#if MGOS_ESP8266_WIFI_ENABLE_WPAENT
 #include <wpa2_enterprise.h>
 #endif
+#endif
 
 #include "common/cs_dbg.h"
 #include "common/cs_file.h"
@@ -204,6 +206,9 @@ bool mgos_wifi_dev_sta_setup(const struct mgos_config_wifi_sta *cfg) {
   wifi_station_set_reconnect_policy(0); /* We manage reconnect ourselves */
 
   if (!mgos_conf_str_empty(cfg->cert) || !mgos_conf_str_empty(cfg->user)) {
+/* WPA enterprise does not work properly on ESP8266 anyway due to lack of
+ * resources. */
+#if MGOS_ESP8266_WIFI_ENABLE_WPAENT
     /* WPA-enterprise mode */
     static char *s_ca_cert_pem = NULL, *s_cert_pem = NULL, *s_key_pem = NULL;
 
@@ -261,6 +266,10 @@ bool mgos_wifi_dev_sta_setup(const struct mgos_config_wifi_sta *cfg) {
     wifi_station_set_wpa2_enterprise_auth(true /* enable */);
   } else {
     wifi_station_set_wpa2_enterprise_auth(false /* enable */);
+#else
+    LOG(LL_ERROR, ("WPA entrprise not supported, rebuild with "
+                   "MGOS_ESP8266_WIFI_ENABLE_WPAENT"));
+#endif
   }
 
   const char *host_name =