'm fuzz' shared lib package should be per-fuzzer.

Change the ClusterFuzz package built by 'make fuzz' to now package
shared libraries per-fuzz target.

Changes documented in go/proposed-clusterfuzz-package

This has the impact of:
 - This package is much easier to post-process in the Haiku export
 cronjob.
 - Shared libraries are now per-fuzz-target. This means that we will
 have some level of duplication (libdl, libc, libc++, libclang_rt.*,
 etc.) as these libraries will be in multiple fuzz target's dirs.

This *only* affects the fuzz-$target-$arch.zip file, not the fuzz targets in
$ANDROID_HOST_OUT/fuzz or $ANDROID_PRODUCT_OUT/data/fuzz. These two
install directories still use the global shared libraries in order to
preserve space on devices.

Bug: 144360679
Test: m fuzz
Change-Id: I5f19a13070e01d2d39598f9f215a983b398a9f37

cc/fuzz.go

@@ -338,6 +338,9 @@ func (s *fuzzPackager) GenerateBuildActions(ctx android.SingletonContext) {
 		collectAllSharedDependencies(module, sharedLibraries, ctx)
 
 		for _, library := range sharedLibraries {
+			archDirs[archDir] = append(archDirs[archDir],
+				fileToZip{library, ccModule.Name() + "/lib"})
+
 			if _, exists := archSharedLibraryDeps[archAndLibraryKey{archDir, library}]; exists {
 				continue
 			}
@@ -379,12 +382,6 @@ func (s *fuzzPackager) GenerateBuildActions(ctx android.SingletonContext) {
 		}
 	})
 
-	// Add the shared library deps for packaging.
-	for key, _ := range archSharedLibraryDeps {
-		archDirs[key.ArchDir] = append(archDirs[key.ArchDir],
-			fileToZip{key.Library, "lib"})
-	}
-
 	for archDir, filesToZip := range archDirs {
 		arch := archDir.Base()
 		hostOrTarget := filepath.Base(filepath.Dir(archDir.String()))