remove OSF1 support

cde/programs/dtmail/dtmail/ComposeCmds.C

@@ -793,14 +793,7 @@ TemplateCmd::doit()
 
     int free_buf = 0;
     mbuf.size = buf.st_size;
-#ifdef __osf__
-    // This version of mmap does NOT allow requested length to be
-    // greater than the file size ...  in contradiction to the
-    // documentation (don't round up).
-    mbuf.buffer = mmap(0, buf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
-#else
     mbuf.buffer = mmap(0, map_size, PROT_READ, MAP_PRIVATE, fd, 0);
-#endif
     if (mbuf.buffer == (char *)-1) {
 	free_buf = 1;
 	mbuf.buffer = new char[mbuf.size];