Revert previous change, i.e., tcldir=$EXAMPLES_DIR/tcl ==> tcldir=$SRC_EXAMPLES_DIR/tcl
Revert previous change, i.e.,
tcldir=$EXAMPLES_DIR/tcl ==> tcldir=$SRC_EXAMPLES_DIR/tcl

As discussed on list the previous change broke "make check" for a separated
build tree and was not necessary for the standard way the installed examples
should be built and executed.

svn path=/trunk/; revision=6060

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot