Fix libtcl not found under Debian/Ubuntu #183
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When running configure on Debian or a derived operating system, such as Ubuntu with the --enable-tcl option, it will fail with libtcl not found--even when libtcl is installed on the system. This is because Debian keeps the library in a non-standard location as part of their 'multiarch implementation.' This small change to configure.ac will fix this, it also adds support for libtcl 8.6. All tests pass OK when the library is linked against libtcl 8.6.