Add OpenBSD support.

GitOrigin-RevId: 80d37bf8b6e55f68f3839bf2093994015176eecb

README.md

@@ -19,7 +19,7 @@ TDLib (Telegram Database library) is a cross-platform library for building [Tele
 
 `TDLib` has many advantages. Notably `TDLib` is:
 
-* **Cross-platform**: `TDLib` can be used on Android, iOS, Windows, macOS, Linux, FreeBSD, Windows Phone, WebAssembly, watchOS, tvOS, Tizen, Cygwin. It should also work on other *nix systems with or without minimal effort.
+* **Cross-platform**: `TDLib` can be used on Android, iOS, Windows, macOS, Linux, FreeBSD, OpenBSD, Windows Phone, WebAssembly, watchOS, tvOS, Tizen, Cygwin. It should also work on other *nix systems with or without minimal effort.
 * **Multilanguage**: `TDLib` can be easily used with any programming language that is able to execute C functions. Additionally it already has native Java (using `JNI`) bindings and .NET (using `C++/CLI` and `C++/CX`) bindings.
 * **Easy to use**: `TDLib` takes care of all network implementation details, encryption and local data storage.
 * **High-performance**: in the [Telegram Bot API](https://core.telegram.org/bots/api), each `TDLib` instance handles more than 24000 active bots simultaneously.

tdutils/td/utils/port/config.h

@@ -19,7 +19,7 @@
 #if TD_LINUX || TD_ANDROID || TD_TIZEN
   #define TD_POLL_EPOLL 1
   #define TD_EVENTFD_LINUX 1
-#elif TD_FREEBSD
+#elif TD_FREEBSD || TD_OPENBSD
   #define TD_POLL_KQUEUE 1
   #define TD_EVENTFD_BSD 1
 #elif TD_CYGWIN

tdutils/td/utils/port/platform.h

@@ -45,6 +45,8 @@
   #define TD_LINUX 1
 #elif defined(__FreeBSD__)
   #define TD_FREEBSD 1
+#elif defined(__OpenBSD__)
+  #define TD_OPENBSD 1
 #elif defined(__CYGWIN__)
   #define TD_CYGWIN 1
 #elif defined(__EMSCRIPTEN__)