[perl #114494] [PATCH] Clean up microperl slightly

# New Ticket Created by  David Leadbeater 
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A patch series of various cleanups for microperl. Nicholas's recent
mail made me have a look to see what would be stripped out if
microperl went, and I noticed a few targets for cleanups while
looking. The main "big" part of microperl remaining is the wholesale
removal of signals.

I also noticed the list of requirements in README.micro is somewhat
outdated, e.g. at least fork() and execl() are linked now, so
microperl is only really going to work on a Unix system.

(This is also at git://github.com/dgl/perl, branch microperl-clean)

• [perl #114494] [PATCH] Clean up microperl slightly by David Leadbeater