Simplify setfattr use by assuming GNU make
* Makefile.in (PAXCTL_if_present, SETFATTR_if_present): New macros. (emacs$(EXEEXT), temacs$(EXEEXT), bootstrap-emacs$(EXEEXT)): Use them. Simplify by using GNU make rather than shell conditionals, by using ln -f rather than rm -f followed by ln, and by preferring $@ to spelling out the destination.
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