[AD] STATICRUNTIME makefile patch for MSVC

["Matthew Leverton" <meffer@xxxxxxxxxx>]

The attached patch gives the STATICRUNTIME builds of MSVC new names by
appending _crt (c run time) to the libraries. In addition it fixes the
problem of incorrectly setting the EMBED_MANIFEST variable when using
the STATICRUNTIME. This is most useful for when using MSVC 8 to deploy
your applications. While the STATICRUNTIME technically provides six
targets, the only practical one is the static version
(alleg_s_crt.lib).

Note that this patch requires six new folders to be present in obj/msvc:

alld_crt
ald_s_crt
alleg_crt
alleg_s_crt
allp_crt
allp_s_crt

When I initially proposed the new names for the STATICRUNTIME, Evert
suggested that some sort of "dirs" target be created to handle them.

--
Matthew Leverton

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