Revert "Revert "Revert "Enable lld for windows"""

This reverts commit 6d8c0a50bc3903f90935e5163e1b9bb46a30d5a9.

The switchover to lld appears to be making adb crash on exit for unclear
reasons. Revert it as a quick fix pending further investigation.

Bug: http://b/134613180
Test: adb.exe under windbg
Change-Id: Ibdf5981c3c6828b3684974b7c30a7c96449c64c5
diff --git a/cc/linker.go b/cc/linker.go
index dda2fcb..fafefdc 100644
--- a/cc/linker.go
+++ b/cc/linker.go
@@ -295,6 +295,10 @@
 	if ctx.Darwin() {
 		return false
 	}
+	// http://b/110800681 - lld cannot link Android's Windows modules yet.
+	if ctx.Windows() {
+		return false
+	}
 	if linker.Properties.Use_clang_lld != nil {
 		return Bool(linker.Properties.Use_clang_lld)
 	}
@@ -348,7 +352,7 @@
 			// darwin defaults to treating undefined symbols as errors
 			flags.LdFlags = append(flags.LdFlags, "-Wl,-undefined,dynamic_lookup")
 		}
-	} else if !ctx.Darwin() && !ctx.Windows() {
+	} else if !ctx.Darwin() {
 		flags.LdFlags = append(flags.LdFlags, "-Wl,--no-undefined")
 	}
 
@@ -385,7 +389,7 @@
 
 	flags.LdFlags = append(flags.LdFlags, proptools.NinjaAndShellEscapeList(linker.Properties.Ldflags)...)
 
-	if ctx.Host() && !ctx.Windows() {
+	if ctx.Host() {
 		rpath_prefix := `\$$ORIGIN/`
 		if ctx.Darwin() {
 			rpath_prefix = "@loader_path/"