move macros to spec/spec.ddoc

[WalterBright]

Since they only apply to the spec.

[dlang-bot]

Thanks for your pull request, @WalterBright!

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[wilzbach]

Sadly there's a common macro file that is used by all three spec builds (html, pdf, epub), but they all use different ones:

dlang.org/posix.mak

Lines 470 to 471 in 0c475b6

	$W/spec/%.html : spec/%.dd $(SPEC_DDOC) $(DMD) $(DDOC_BIN)
	$(DDOC_BIN) --compiler=$(DMD) -o$@ $(SPEC_DDOC) $<

dlang.org/posix.mak

Lines 522 to 523 in 0c475b6

	$G/dlangspec.html : $(DDOC) ebook.ddoc $G/dlangspec.d $(DMD)
	$(DMD) -conf= -Df$@ $(DDOC) ebook.ddoc $G/dlangspec.d

dlang.org/posix.mak

Lines 545 to 546 in 0c475b6

	$G/dlangspec.tex : $G/dlangspec-consolidated.d $(DMD) $(DDOC) spec/latex.ddoc $(NODATETIME)
	$(DMD) -conf= -Df$@ $(DDOC) spec/latex.ddoc $(NODATETIME) $<

Should I quickly add a spec/macros.dd which is shared by all three or do you have a better idea?

[WalterBright]

I said it was a disaster :-)

The reason for 3 .ddoc files is there's no way to do conditionals with macros. So for different expansions, different .ddoc files are needed. However, the identical macros should be merged into a common file.

Feel free to reorganize it. Just be sure and add comments to the makefile about what is going on!