Add DMD as a submodule

Geod24 · Geod24 · commit 86950e18fd17 · 2021-01-20T17:21:19.000+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 a180d279ac69391fc3bdc423ff9e43c46f3c1dbd

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`