This resolves a large number of compiler warnings from GCC 4.10 which
cause the build to fail under dev mode. The vast majority are
signed/unsigned mismatches in printf-style format strings.
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When res_adsi is unloaded, it removes the ADSI functions that it previously installed
by passing a NULL adsi_funcs pointer to ast_adsi_install_funcs.  This function was not
checking whether or not the adsi_funcs pointer passed in was NULL before dereferencing
it to check whether or not the version of the functions matches what the core was
expecting it.

This patch makes it so that the version is only checked if a potentially valid adsi_funcs
pointer was passed in.  Passing in NULL removes the installed functions, bypassing the
version check.
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  r369323 | mmichelson | 2012-06-25 10:35:43 -0500 (Mon, 25 Jun 2012) | 9 lines
  
  Eliminate embedding of res_adsi.so module.
  
  The way this is done is to stop using the optional API.
  Instead, res_adsi.so, when loaded fills in a table of
  function pointers.
  
  Review: https://reviewboard.asterisk.org/r/1991
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  r369324 | mmichelson | 2012-06-25 10:50:17 -0500 (Mon, 25 Jun 2012) | 2 lines
  
  Forgot to svn add this file in my last commit.
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