[mtouch] -lsqlite3 is a linker flag, not a file to be linked with, so…

… treat it accordingly. Fixes #49220. (#1317)

-lsqlite3 is a linker flag, not a file to be linked with, so when
automatically determining that we need to pass -lsqlite3 we need to put it in
the right list of linker information.

Otherwise we may end up passing `-force_load -lsqlite3` to the linker (if the
assembly's ForceLoad flag is set), which won't compile.

https://bugzilla.xamarin.com/show_bug.cgi?id=49220

tests/mtouch/MTouch.cs

@@ -2085,6 +2085,34 @@ public void MT2015 ()
 			}
 		}
 
+		[Test]
+		public void AutoLinkWithSqlite ()
+		{
+			using (var mtouch = new MTouchTool ()) {
+				mtouch.Profile = Profile.iOS;
+				mtouch.CreateTemporaryApp (code: @"
+using System.Runtime.InteropServices;
+using Foundation;
+using ObjCRuntime;
+
+[assembly: LinkWith (ForceLoad = true)]
+
+[Preserve (AllMembers = true)]
+public class TestApp {
+	[DllImport (""sqlite3"")]
+	static extern void sqlite3_exec ();
+
+	static void Main ()
+	{
+		System.Console.WriteLine (typeof (ObjCRuntime.Runtime).ToString ());
+	}
+}
+");
+				mtouch.Linker = MTouchLinker.DontLink; // just to make the test run faster.
+				mtouch.AssertExecute (MTouchAction.BuildSim, "build");
+			}
+		}
+
 #region Helper functions
 		static string CompileUnifiedTestAppExecutable (string targetDirectory, string code = null, string extraArg = "")
 		{

tools/common/Assembly.cs

@@ -370,16 +370,16 @@ public void ComputeLinkerFlags ()
 					case "libsystem_kernel":
 						break;
 					case "sqlite3":
-						if (LinkWith == null)
-							LinkWith = new List<string> ();
-						LinkWith.Add ("-lsqlite3");
+						if (LinkerFlags == null)
+							LinkerFlags = new List<string> ();
+						LinkerFlags.Add ("-lsqlite3");
 						Driver.Log (3, "Linking with {0} because it's referenced by a module reference in {1}", file, FileName);
 						break;
 					case "libsqlite3":
 						// remove lib prefix
-						if (LinkWith == null)
-							LinkWith = new List<string> ();
-						LinkWith.Add ("-l" + file.Substring (3));
+						if (LinkerFlags == null)
+							LinkerFlags = new List<string> ();
+						LinkerFlags.Add ("-l" + file.Substring (3));
 						Driver.Log (3, "Linking with {0} because it's referenced by a module reference in {1}", file, FileName);
 					break;
 					case "libGLES":