Log message:
Remove USE_BUILDLINK3 and NO_BUILDLINK; these are no longer used.

Log message:
patch tclConfig.sh and tkConfig.sh so that they do not contain references
to the build environment, which of course no longer exists once we
install the file.  Also make sure that variables are set using
double quotes, so that variables inside are expanded.  Ok jwise@.

Log message:
Actually, that conditional doesn't even need the !empty() now; just defined().

Log message:
Fix bug in previous:  Check for a variable's definition before checking its
value (otherwise older [b]make breaks on a "malformed conditional").

Log message:
On 64bit capable platforms, --enable-64bit

Log message:
Add RMD160 digests

Log message:
fix build on Darwin:

- libtool needs -dynamiclib on Darwin to create shared libraries
- don't use libtool to create the static libtclstub.a, do it the same
  way that tcl 8.4 does
- name library libtcl83 (as opposed to libtcl8.3) like other platforms
- remove PLIST unnecessary hack for Darwin shlib name

Log message:
Under libtool, only the .la goes in the PLIST now.  (I'm not entirely
convinced that Darwin needs special handling here.  Does the Darwin build
*not* use libtool!?)

Log message:
Unused (thanks, minskim).

Log message:
If we include this bl* file, we only want the 8.3 version -- fix pattern
to make it so.