cleanup: Some portability/warning fixes for Windows builds.

Author: iphydf

other/bootstrap_daemon/docker/tox-bootstrapd.sha256

@@ -1 +1 @@
-7923791feaca748f570f81dd79556c7763fa2f7611e3790129fe44ffa95cf916  /usr/local/bin/tox-bootstrapd
+269d2d95028f192bbf65a01b938068b8fc9e798bbe1d5ecaf67cae124e45c2a9  /usr/local/bin/tox-bootstrapd

toxcore/network.c

@@ -21,7 +21,7 @@
 #define _XOPEN_SOURCE 700
 #endif
 
-#if defined(_WIN32) && _WIN32_WINNT >= _WIN32_WINNT_WINXP
+#if defined(_WIN32) && defined(_WIN32_WINNT) && _WIN32_WINNT >= _WIN32_WINNT_WINXP
 #undef _WIN32_WINNT
 #define _WIN32_WINNT  0x501
 #endif
@@ -361,13 +361,9 @@ IP4 get_ip4_loopback(void)
 
 IP6 get_ip6_loopback(void)
 {
-    IP6 loopback;
-#ifdef ESP_PLATFORM
-    loopback = empty_ip_port.ip.ip.v6;
+    /* in6addr_loopback isn't available everywhere, so we do it ourselves. */
+    IP6 loopback = empty_ip_port.ip.ip.v6;
     loopback.uint8[15] = 1;
-#else
-    get_ip6(&loopback, &in6addr_loopback);
-#endif
     return loopback;
 }
 
@@ -565,15 +561,15 @@ non_null()
 static int sys_getsockopt(void *obj, int sock, int level, int optname, void *optval, size_t *optlen)
 {
     socklen_t len = *optlen;
-    const int ret = getsockopt(sock, level, optname, optval, &len);
+    const int ret = getsockopt(sock, level, optname, (char *)optval, &len);
     *optlen = len;
     return ret;
 }
 
 non_null()
 static int sys_setsockopt(void *obj, int sock, int level, int optname, const void *optval, size_t optlen)
 {
-    return setsockopt(sock, level, optname, optval, optlen);
+    return setsockopt(sock, level, optname, (const char *)optval, optlen);
 }
 
 static const Network_Funcs system_network_funcs = {