cuttlefish: Stop building the CVD host package tarball by default.

This change causes us to stop building the CVD host package during
the default `m` build, as this is one of the most time consuming steps
of incremental builds, taking around a minute on my machine. Instead,
we build a directory containing the host package contents. A companion
change to acloud teaches it to upload the directory if it exists.

The host package tarball will continue to be built with `m dist` and `m
hosttar`. When building the host package, just create it from the package
contents directory instead of going through a zip file as we were before.

Bug: 273862156
Change-Id: Id7ab47cd5a2e96d073fcc21ed82d3719119df6b9
diff --git a/android/packaging.go b/android/packaging.go
index 4a9b591..c764a6d 100644
--- a/android/packaging.go
+++ b/android/packaging.go
@@ -238,11 +238,11 @@
 
 // CopySpecsToDir is a helper that will add commands to the rule builder to copy the PackagingSpec
 // entries into the specified directory.
-func (p *PackagingBase) CopySpecsToDir(ctx ModuleContext, builder *RuleBuilder, specs map[string]PackagingSpec, dir ModuleOutPath) (entries []string) {
+func (p *PackagingBase) CopySpecsToDir(ctx ModuleContext, builder *RuleBuilder, specs map[string]PackagingSpec, dir WritablePath) (entries []string) {
 	seenDir := make(map[string]bool)
 	for _, k := range SortedKeys(specs) {
 		ps := specs[k]
-		destPath := dir.Join(ctx, ps.relPathInPackage).String()
+		destPath := filepath.Join(dir.String(), ps.relPathInPackage)
 		destDir := filepath.Dir(destPath)
 		entries = append(entries, ps.relPathInPackage)
 		if _, ok := seenDir[destDir]; !ok {