Fix DSO open, specifically for auth modules like GNOME keyring

From: David Rothenberger <daveroth@acm.org>

support. Thanks to Yaakov for the patch.

http://cygwin.com/ml/cygwin/2012-03/msg00835.html
---
 subversion/libsvn_fs/fs-loader.c |    7 ++++++-
 subversion/libsvn_ra/ra_loader.c |    7 ++++++-
 subversion/libsvn_subr/auth.c    |    4 ++++
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/subversion/libsvn_fs/fs-loader.c b/subversion/libsvn_fs/fs-loader.c
index 336b84f..63ef3cc 100644
--- a/subversion/libsvn_fs/fs-loader.c
+++ b/subversion/libsvn_fs/fs-loader.c
@@ -121,7 +121,12 @@ load_module(fs_init_func_t *initfunc, const char *name, apr_pool_t *pool)
                                  _("Invalid name for FS type '%s'"),
                                  name);
 
-    libname = apr_psprintf(pool, "libsvn_fs_%s-%d.so.%d",
+    libname = apr_psprintf(pool,
+#ifdef __CYGWIN__
+                           "cygsvn_fs_%s-%d-%d.dll",
+#else
+                           "libsvn_fs_%s-%d.so.%d",
+#endif
                            name, SVN_VER_MAJOR, SVN_SOVERSION);
     funcname = apr_psprintf(pool, "svn_fs_%s__init", name);
 
diff --git a/subversion/libsvn_ra/ra_loader.c b/subversion/libsvn_ra/ra_loader.c
index d9cb96b..ae17d84 100644
--- a/subversion/libsvn_ra/ra_loader.c
+++ b/subversion/libsvn_ra/ra_loader.c
@@ -141,7 +141,12 @@ load_ra_module(svn_ra__init_func_t *func,
     const char *compat_funcname;
     apr_status_t status;
 
-    libname = apr_psprintf(pool, "libsvn_ra_%s-%d.so.%d",
+    libname = apr_psprintf(pool,
+#ifdef __CYGWIN__
+                           "cygsvn_ra_%s-%d-%d.dll",
+#else
+                           "libsvn_ra_%s-%d.so.%d",
+#endif
                            ra_name, SVN_VER_MAJOR, SVN_SOVERSION);
     funcname = apr_psprintf(pool, "svn_ra_%s__init", ra_name);
     compat_funcname = apr_psprintf(pool, "svn_ra_%s_init", ra_name);
diff --git a/subversion/libsvn_subr/auth.c b/subversion/libsvn_subr/auth.c
index a999711..6f88853 100644
--- a/subversion/libsvn_subr/auth.c
+++ b/subversion/libsvn_subr/auth.c
@@ -455,7 +455,11 @@ svn_auth_get_platform_specific_provider(svn_auth_provider_object_t **provider,
       const char *library_label, *library_name;
       const char *provider_function_name, *version_function_name;
       library_name = apr_psprintf(pool,
+#ifdef __CYGWIN__
+                                  "cygsvn_auth_%s-%d-%d.dll",
+#else
                                   "libsvn_auth_%s-%d.so.%d",
+#endif
                                   provider_name,
                                   SVN_VER_MAJOR, SVN_SOVERSION);
       library_label = apr_psprintf(pool, "svn_%s", provider_name);