Add DMD as a submodule

Geod24 · Geod24 · commit 95f997312701 · 2022-03-02T10:11:41.000+09:00
This will allow us to remove the duplication between DMC and DMD,
and simplify updating DMC whenever DMD changes.
diff --git a/.gitmodules b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "dmd"]
+	path = dm/src/dmd
+	url = https://github.com/dlang/dmd.git
diff --git a/dm/src/dmd b/dm/src/dmd
@@ -0,0 +1 @@
+Subproject commit 2d30d2fd5fd376a1b8f3f6c59ad325b8d1a19329

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+[submodule "dmd"]`
	`2`	`+ path = dm/src/dmd`
	`3`	`+ url = https://github.com/dlang/dmd.git`