dmd.builtin: Match any submodule of the std.math package

[ibuclaw]

Unblocks dlang/phobos#7942 and dlang/phobos#7943 (though haven't tested the latter locally).

We are already matching std.math.* in the back-end, the fix just wasn't applied to the front-end as well.

dmd/src/dmd/toir.d

Lines 512 to 521 in e658df1

	// ... except std.math package and core.stdc.stdarg.va_start.
	if (md.packages.length == 2)
	{
	// Matches any module in std.math.*
	if (md.packages[1] == Id.math && id1 == Id.std)
	{
	goto Lstdmath;
	}
	goto Lva_start;
	}

[dlang-bot]

Thanks for your pull request, @ibuclaw!

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Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#12420"