posix.mak - module specific -dip25/1000 for someModule.test and unittest rules

[carblue]

@wilzbach
Discussion about this topic is also in
#6041
#6181

aa represents the current state of "phobos -dip1000 compilability".

I preferred associative array aa entries in the "modulename-notation" (e.g. aa[std.array]) instead of OS-dependant "pathname-notation" (didn't recall whether windows can cope with forward-slashes).
But this only defers the issue to the call-site (I use Linux, i.e. /): $(aa[$(subst /,.,$(basename $<))])

Used currently in 2 rules, e.g.
%.test : %.d $(LIB)
T=mktemp -d /tmp/.dmd-run-test.XXXXXX &&
(
$(DMD) -od$$T $(DFLAGS) $(aa[$(subst /,.,$(basename $&lt;))]) -main $(UDFLAGS) $(LIB) -defaultlib= -debuglib= $(LINKDL) -cov -run $< ;
RET=$$? ; rm -rf $$T ; exit $$RET
)

Positioning $(aa[$(subst /,.,$(basename $&lt;))]) after $(DFLAGS) resulting in e.g. -dip25 -dip1000 always worked for me, the compiler picked up the last one.

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[wilzbach]

Looks good and I'm aware that #6041 is blocking this.
(Though of course I hope that we can switch to -dip1000 by default soon)

CC @CyberShadow @MartinNowak - are you okay with this approach too?

[carblue]

This lacks reply from CyberShadow or MartinNowak for more than 2 weeks, thus closing this PR