Do a link test in AST_EXT_TOOL_CHECK() to ensure we have all the required libs

reported by the tool.

(closes issue #12067, reported by Juggie, patched by me)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@108740 65c4cc65-6c06-0410-ace0-fbb531ad65f3