Fix parallel bootstrap on MS-Windows in lib/ and lisp/.
lib/makefile.w32-in ($(GNULIBOBJS)): Depend on stamp_BLD. This replaces separate dependency for each object file, which required the same object file to be mentioned twice, causing failures in parallel builds. lisp/makefile.w32-in (compile, compile-always): Depend on update-subdirs, not on subdirs.el. Otherwise, several different sub-targets of 'bootstrap' running in parallel could simultaneously write to subdirs.el, producing a garbled file.
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