+ remove recursive-mutex definitions, finish threading demo for worm.c
+ remove a redundant adjustment of lines in resizeterm.c's
adjust_window() which caused occasional misadjustment of stdscr when
softkeys were used.
+ add new functions to lib_trace.c to setup mutex's for the _tracef()
calls within the ncurses library.
+ for the reentrant model, move _nc_tputs_trace and _nc_outchars into
the SCREEN.
+ start modifying test/worm.c to provide threading demo (incomplete).
+ separated ifdef's for some BSD-related symbols in tset.c, to make
it compile on LynxOS (report by Greg Gemmer).
+ modify Ada95/gen/Makefile to use shlib script, to simplify building
shared-library configuration on platforms lacking rpath support.
+ build-fix for Ada95/src/Makefile to reflect changed dependency for
the terminal-interface-curses-aux.adb file which is now generated.
+ restructuring test/worm.c, for use_window() example.
