libssh: git repo for source retrieval

We now use 'http://git.libssh.org/projects/libssh.git'

Fix #1428

repos/libports/ports/libssh.hash

@@ -1 +1 @@
-d0be44e90e85d47ce12433e826086873f1d28f0f
+b1af2c16eab9443e1df8ea32eb4f74f9896e072f

repos/libports/ports/libssh.port

@@ -1,10 +1,9 @@
 LICENSE   := LGPL
-DOWNLOADS := libssh.archive
-VERSION   := 0.5.4
+VERSION   := git
+DOWNLOADS := libssh.git
 
-URL(libssh) := https://red.libssh.org/attachments/download/41/libssh-$(VERSION).tar.gz
-SIG(libssh) := https://red.libssh.org/attachments/download/42/libssh-$(VERSION).tar.asc
-SHA(libssh) := 4a372378db8fffaf28d5c79d80b2235843aa587c
+URL(libssh) := https://git.libssh.org/projects/libssh.git
+REV(libssh) := tags/libssh-0.5.4
 DIR(libssh) := src/lib/libssh
 
 DIRS := include