[b9e1a3032e] Implement the documented method search order for TclOO.
This corrects the relative positions of object-defined methods and class mixins.
Use TclpSys* macros, not direct system calls.
Combine TCL_SHLIB_LD_EXTRAS+TK_SHLIB_LD_EXTRAS to a single SHLIB_LD_LIBS usable for both Tcl and Tk.
Combine TCL_SHLIB_LD_EXTRAS+TK_SHLIB_LD_EXTRAS (for Cygwin and FreeBSD) to a single SHLIB_LD_LIBS usable for both Tcl and Tk
merge trunk