unix: copy tcl directories separately

macOS `cp` doesn't behave the same as Linux and was putting the files in
the wrong directory. With this, I am able to run a tcl/tk/tix Python
application with the build distribution!

Author: indygreg

cpython-unix/build-cpython.sh

@@ -243,7 +243,9 @@ rm -f ${ROOT}/out/python/build/lib/{libdb-6.0,libxcb-*,libX11-xcb}.a
 
 # Copy tcl/tk/tix resources needed by tkinter.
 mkdir ${ROOT}/out/python/install/lib/tcl
-cp -av ${TOOLS_PATH}/deps/lib/{tcl8,tcl8.6,thread2.8.4,Tix8.4.3,tk8.6}/ ${ROOT}/out/python/install/lib/tcl/
+for source in ${TOOLS_PATH}/deps/lib/{tcl8,tcl8.6,thread2.8.4,Tix8.4.3,tk8.6}; do
+  cp -av $source ${ROOT}/out/python/install/lib/tcl/
+done
 
 # config.c defines _PyImport_Inittab and extern references to modules, which
 # downstream consumers may want to strip. We bundle config.c and config.c.in so