Fix macos build.

Author: evoskuil

src/file/utilities.cpp

@@ -262,9 +262,10 @@ int open(const path& filename, bool MSC_OR_NOAPPLE(random)) NOEXCEPT
 #else
     // open sets errno on failure.
     file_descriptor = ::open(path.c_str(), O_RDWR, S_IRUSR | S_IWUSR);
+
+#if !defined(HAVE_APPLE)
     if (file_descriptor != -1)
     {
-#if !defined(HAVE_APPLE)
         // _O_RANDOM equivalent, posix_fadvise returns error on failure.
         const auto advice = random ? POSIX_FADV_RANDOM : POSIX_FADV_SEQUENTIAL;
         const auto result = ::posix_fadvise(file_descriptor, 0, 0, advice);
@@ -273,8 +274,8 @@ int open(const path& filename, bool MSC_OR_NOAPPLE(random)) NOEXCEPT
             close(file_descriptor);
             file_descriptor = -1;
             errno = result;
-        } else
-#endif
+        }
+        else
         {
             // _SH_DENYWR equivalent.
             const struct flock lock{ F_WRLCK, SEEK_SET, 0, 0 };
@@ -287,7 +288,8 @@ int open(const path& filename, bool MSC_OR_NOAPPLE(random)) NOEXCEPT
             }
         }
     }
-#endif
+#endif // !HAVE_APPLE
+#endif // HAVE_MSC
 
     return file_descriptor;
 }