Makeover for Unixware 7.1.1

* Makefile: Add more standard targets.  Improve shell redirection in GNU
make detection.
* src/backend/access/transam/rmgr.c: Fix incorrect(?) C.
* src/backend/libpq/pqcomm.c (StreamConnection): Work around accept() bug.
* src/include/port/unixware.h: ...with help from here.
* src/backend/nodes/print.c (plannode_type): Remove some "break"s after
"return"s.
* src/backend/tcop/dest.c (DestToFunction): ditto.
* src/backend/nodes/readfuncs.c: Add proper prototypes.
* src/backend/utils/adt/numutils.c (pg_atoi): Cope specially with strtol()
setting EINVAL. This saves us from creating an extra set of regression test
output for the affected systems.
* src/include/storage/s_lock.h (tas): Correct prototype.
* src/interfaces/libpq/fe-connect.c (parseServiceInfo): Don't use variable
as dimension in array definition.
* src/makefiles/Makefile.unixware: Add support for GCC.
* src/template/unixware: same here
* src/test/regress/expected/abstime-solaris-1947.out: Adjust whitespace.
* src/test/regress/expected/horology-solaris-1947.out: Part of this file
was evidently missing.
* src/test/regress/pg_regress.sh: Fix shell.  mkdir -p returns non-zero if
the directory exists.
* src/test/regress/resultmap: Add entries for Unixware.

src/backend/access/transam/rmgr.c

@@ -52,8 +52,12 @@ RmgrData   RmgrTable[] = {
 {"Gist", gist_redo, gist_undo, gist_desc}
 };
 
-#else
+#else /* not XLOG */
 
-RmgrData   RmgrTable[] = {};
+/*
+ * This is a dummy, but don't write RmgrTable[] = {} here,
+ * that's not accepted by some compilers. -- petere
+ */
+RmgrData   RmgrTable[1];
 
-#endif
+#endif /* not XLOG */