Add hashlink as a submodule.

tools/platforms/LinuxPlatform.hx

@@ -417,6 +417,10 @@ class LinuxPlatform extends PlatformTarget
 			}
 		}
 
+		if(targetFlags.exists("hl")) {
+			CPPHelper.rebuild(project, commands, null, "BuildHashlink.xml");
+		}
+
 		CPPHelper.rebuild(project, commands);
 	}
 

tools/platforms/MacPlatform.hx

@@ -379,6 +379,11 @@ class MacPlatform extends PlatformTarget
 			}
 		}
 
+		if (targetFlags.exists("hl"))
+		{
+			CPPHelper.rebuild(project, commands, null, "BuildHashlink.xml");
+		}
+
 		CPPHelper.rebuild(project, commands);
 	}
 

tools/platforms/WindowsPlatform.hx

@@ -685,6 +685,11 @@ class WindowsPlatform extends PlatformTarget
 				}
 			}
 
+			if (targetFlags.exists("hl"))
+			{
+				CPPHelper.rebuild(project, commands, null, "BuildHashlink.xml");
+			}
+
 			CPPHelper.rebuild(project, commands);
 		}
 	}