fix: remove abort() call from tr_assert_message() (#4696)

libtransmission/tr-assert.mm

@@ -5,8 +5,6 @@
 
 #import <Foundation/Foundation.h>
 
-#include <cstdlib> // for abort()
-
 #include <fmt/format.h>
 
 #include "tr-assert.h"
@@ -20,10 +18,6 @@
 {
     auto const full_text = fmt::format(FMT_STRING("assertion failed: {:s} ({:s}:{:d})"), message, file, line);
     [NSException raise:NSInternalInconsistencyException format:@"%s", full_text.c_str()];
-
-    // We should not reach this anyway, but it helps mark the function as property noreturn
-    // (the Objective-C NSException method does not).
-    abort();
 }
 
 #endif