cmake hack to make hekad work w/ local clones

hekad_local_clone

diff --git a/cmake/externals.cmake b/cmake/externals.cmake
index 78c09f0..05e7a08 100644
--- a/cmake/externals.cmake
+++ b/cmake/externals.cmake
@@ -63,12 +63,19 @@ function(hg_clone url tag)
     add_dependencies(GoPackages ${_name})
 endfunction(hg_clone)
 
+function(local_clone ${_url})
+    string(REGEX REPLACE ".*/" "" _name ${url})
+    add_dependencies(GoPackages ${_name})
+endfunction(local_clone)
+
 function(add_external_plugin vcs url tag)
     string(REGEX REPLACE "https?://" "" _path ${url})
     if ("${vcs}" STREQUAL "git")
        git_clone(${url} ${tag})
     elseif("${vcs}" STREQUAL "hg")
        hg_clone(${url} ${tag})
+    elseif("${vcs}" STREQUAL "local_clone")
+       local_clone(${url})
     else()
         message(FATAL_ERROR "Unknown version control system ${vcs}")
     endif()