git-gui: mkdir -p when initializing new remote repository

This allows the user to create repositories with arbitrary paths
on the server. The downside is that errorneously typed paths are
not caught but instead created remotely; YMMV.
Signed-off-by: NPetr Baudis <petr.baudis@novartis.com>
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

lib/remote_add.tcl

@@ -144,8 +144,9 @@ method _add {} {
 			if {[info exists env(GIT_SSH)]} {
 				set ssh $env(GIT_SSH)
 			}
-			lappend cmds [list exec $ssh $host git --git-dir=$path init --bare]
+			lappend cmds [list exec $ssh $host mkdir -p $location && git --git-dir=$path init --bare]
 		} elseif { ! [regexp {://} $location xx] } {
+			lappend cmds [list exec mkdir -p $location]
 			lappend cmds [list exec git --git-dir=$location init --bare]
 		} else {
 			tk_messageBox \