These have done nothing except emit a warning saying they are no
longer required for a long time.
One exception is guile and mzscheme still define non-trivial
specialize_std_map_on_* - it seems they were missed for some
reason, but the same improved machinery which meant these macros
are no longer required for other target languages should apply
to them too.
- source files and Makefiles need never be executable
- scripts are run directly by their interpreters in the
test suites, so also do not need to be executable
Olly Betts