Haiku: Remove outdated preprocessor checks

* Haiku does not define __BEOS__ anymore, so there is no need to guard
  these BeOS specific workaround for Haiku.
* The workaround themselves are not needed for Haiku as it has much
  better POSIX compatibility than BeOS did.

Applied-by: Rolf Eike Beer <eike@sf-mail.de>

Utilities/cmcurl/CMake/CurlTests.c

@@ -38,7 +38,7 @@ main ()
 # define PLATFORM_AIX_V3
 #endif
 
-#if defined(PLATFORM_SUNOS4) || defined(PLATFORM_AIX_V3) || (defined(__BEOS__) && !defined(__HAIKU__))
+#if defined(PLATFORM_SUNOS4) || defined(PLATFORM_AIX_V3) || defined(__BEOS__)
 #error "O_NONBLOCK does not work on this platform"
 #endif
   int socket;

Utilities/cmcurl/select.c

@@ -39,7 +39,7 @@
 #error "We can't compile without select() support!"
 #endif
 
-#if defined(__BEOS__) && !defined(__HAIKU__)
+#if defined(__BEOS__)
 /* BeOS has FD_SET defined in socket.h */
 #include <socket.h>
 #endif

Utilities/cmzlib/zconf.h

@@ -237,7 +237,7 @@
 #  endif
 #endif
 
-#if defined (__BEOS__) && !defined (__HAIKU__)
+#if defined (__BEOS__)
 #  ifdef ZLIB_DLL
 #    ifdef ZLIB_INTERNAL
 #      define ZEXPORT   __declspec(dllexport)

Utilities/cmzlib/zutil.h

@@ -147,12 +147,6 @@ extern const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
 #  define OS_CODE  0x0f
 #endif
 
-/* Haiku defines both __HAIKU__ and __BEOS__ (for now) */
-/* many BeOS workarounds are no longer needed in Haiku */
-#if defined(__HAIKU__) && defined(__BEOS__)
-#undef __BEOS__
-#endif
-
 #if defined(_BEOS_) || defined(RISCOS) 
 #  define fdopen(fd,mode) NULL /* No fdopen() */
 #endif