patch 7.4.907

Problem:    Libraries for dynamically loading interfaces can only be defined
            at compile time.
Solution:   Add options to specify the dll names. (Kazuki Sakamoto,
            closes #452)

runtime/doc/if_lua.txt

@@ -1,4 +1,4 @@
-*if_lua.txt*    For Vim version 7.4.  Last change: 2013 Sep 04
+*if_lua.txt*    For Vim version 7.4.  Last change: 2015 Oct 16
 
 
 		  VIM REFERENCE MANUAL    by Luis Carvalho
@@ -14,6 +14,7 @@ The Lua Interface to Vim				*lua* *Lua*
 6. Buffer userdata		|lua-buffer|
 7. Window userdata		|lua-window|
 8. The luaeval function		|lua-luaeval|
+9. Dynamic loading		|lua-dynamic|
 
 {Vi does not have any of these commands}
 
@@ -399,5 +400,24 @@ Examples: >
 	:echo Rand(1,10)
 
 
+==============================================================================
+9. Dynamic loading				    *lua-dynamic*
+
+On MS-Windows and Unix the Lua library can be loaded dynamically.  The
+|:version| output then includes |+lua/dyn|.
+
+This means that Vim will search for the Lua DLL or shared library file only
+when needed.  When you don't use the Lua interface you don't need it, thus
+you can use Vim without this file.
+
+On MS-Windows to use the Lua interface the Lua DLL must be in your search path.
+In a console window type "path" to see what directories are used.  The version
+of the DLL must match the Lua version Vim was compiled with.
+
+On Unix the 'luadll' option can be used to specify the Lua shared library file
+instead of DYNAMIC_LUA_DLL file what was specified at compile time.  The
+version of the shared library must match the Lua version Vim was compiled with.
+
+
 ==============================================================================
  vim:tw=78:ts=8:noet:ft=help:norl: