MacOS fixes

src/mqtt/ServiceEnvelope.h

@@ -5,7 +5,8 @@
 // meshtastic_ServiceEnvelope that automatically releases dynamically allocated memory when it goes out of scope.
 struct DecodedServiceEnvelope : public meshtastic_ServiceEnvelope {
     DecodedServiceEnvelope(const uint8_t *payload, size_t length);
-    DecodedServiceEnvelope(DecodedServiceEnvelope &) = delete;
+    // const-qualified so std::variant instantiation works on Apple libc++ (copying stays ill-formed either way)
+    DecodedServiceEnvelope(const DecodedServiceEnvelope &) = delete;
     DecodedServiceEnvelope(DecodedServiceEnvelope &&);
     ~DecodedServiceEnvelope();
     // Clients must check that this is true before using.

test/test_http_content_handler/test_main.cpp

@@ -1,4 +1,5 @@
 #include "TestUtil.h"
+#include <cstdlib>
 #include <unity.h>
 
 static void test_placeholder()

test/test_traffic_management/test_main.cpp

@@ -1,4 +1,5 @@
 #include "TestUtil.h"
+#include <cstdlib>
 #include <unity.h>
 
 #if defined(ARCH_PORTDUINO)

variants/native/portduino.ini

@@ -55,7 +55,6 @@ build_flags_common =
   -lyaml-cpp
   -ljsoncpp
   !pkg-config --cflags jsoncpp --silence-errors || :
-  -li2c
   -luv
   -std=gnu17
   -std=gnu++17