Add zip_source(3) and use instead of links to all implementations.

These lists are not updated often, it seems.

man/zip_source_file.mdoc

diff --git a/man/zip_source_file.mdoc b/man/zip_source_file.mdoc
index 0f3ba20..5d13436 100644
--- a/man/zip_source_file.mdoc
+++ b/man/zip_source_file.mdoc
@@ -1,5 +1,5 @@
 .\" zip_source_file.mdoc -- create data source from a file
-.\" Copyright (C) 2004-2008 Dieter Baron and Thomas Klausner
+.\" Copyright (C) 2004-2014 Dieter Baron and Thomas Klausner
 .\"
 .\" This file is part of libzip, a library to manipulate ZIP archives.
 .\" The authors can be contacted at <libzip@nih.at>
@@ -29,7 +29,7 @@
 .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 .\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd August 1, 2008
+.Dd August 2, 2014
 .Dt ZIP_SOURCE_FILE 3
 .Os
 .Sh NAME
@@ -89,11 +89,7 @@
 .Xr libzip 3 ,
 .Xr zip_add 3 ,
 .Xr zip_replace 3 ,
-.Xr zip_source_buffer 3 ,
-.Xr zip_source_filep 3 ,
-.Xr zip_source_free 3 ,
-.Xr zip_source_function 3 ,
-.Xr zip_source_zip 3
+.Xr zip_source 3
 .Sh AUTHORS
 .An -nosplit
 .An Dieter Baron Aq Mt dillo@nih.at