Prevent to use conditional inclusion preprocessor feature (since C++23)

`#elifdef` is supported since C23 and C++23, but such newer compiler
is not required here.

Signed-off-by: OBATA Akio <obache@wizdas.com>

tdeio/tdeio/global.cpp

@@ -1307,7 +1307,7 @@ TDEIO_EXPORT TQByteArray TDEIO::rawErrorDetail(int errorCode, const TQString &er
 #endif
 #ifdef HAVE_SYS_UCRED_H
 #include <sys/ucred.h>
-#elifdef HAVE_UCRED_H
+#elif defined(HAVE_UCRED_H)
 #include <ucred.h>
 #endif
 #ifdef HAVE_SYS_MOUNT_H