[PATCH] Improve conformance to ISO C90

Hi,

attached patch fixes compatibility with ISO C90. It fixes
trailing commas in enum lists as well as one case where variadic
macros are used, which are a feature of C99. What it does not fix
is strings with overlength (C90 only allows for fixed strings
with a maximum length of 509 characters).

This allows us to build the code with `-Werror -pedantic
-Wno-overlength-strings`.

[[
Improve C90 compatibility by removing trailing commas in enum
lists as well as converting a variadic macro stub with an empty
function.

* subversion/include/svn_client.h:
  (svn_client_config_option_id_t): remove trailing comma
* subversion/include/svn_wc.h:
  (svn_wc_notify_action_t): remove trailing comma
* subversion/libsvn_subr/cache-membuffer.c:
  (prefix_pool_create): remove trailing comma
* subversion/svn/svn.c:
  (svn_cl__longopt_t): remove trailing comma
* subversion/svnmucc/svnmucc.c:
  (sub_main): remove trailing comma
* subversion/svnmover/linenoise/linenouse.c:
  (lndebug): replace variadic macro stub with an empty variadic
  function
]]

-- 
Patrick Steinhardt, Entwickler
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