[ox/std] Fix __has_include logic

deps/ox/src/ox/std/stacktrace.cpp

@@ -6,7 +6,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-#if defined(OX_USE_STDLIB)
+#if defined(OX_USE_STDLIB) && __has_include(<unistd.h>)
 #include <array>
 #include <execinfo.h>
 #include <iostream>
@@ -18,7 +18,7 @@
 namespace ox {
 
 void printStackTrace([[maybe_unused]]int shave) {
-#if defined(OX_USE_STDLIB)
+#if defined(OX_USE_STDLIB) && __has_include(<unistd.h>)
 	std::array<void*, 100> frames;
 	auto size = static_cast<int>(backtrace(frames.data(), frames.size()));
 	if (size > shave) {

deps/ox/src/ox/std/trace.cpp

@@ -15,8 +15,6 @@
 
 #include "trace.hpp"
 
-int counter = 0;
-
 extern "C"
 void oxTraceHook([[maybe_unused]] const char *file, [[maybe_unused]] int line,
                  [[maybe_unused]] const char *ch, [[maybe_unused]] const char *msg) {