[cc_fuzz] Statically link libcxx.

Statically links libcxx in order to not require shared library
deployment during packing of fuzz targets.

Test: m example_fuzzer && ldd $ANDROID_HOST_OUT/fuzz/example_fuzzer.
Note that the ldd results don't include libc++.so.
Bug: 139880425

Change-Id: I86d1945768de53217d54cb762392c20714494416

cc/fuzz.go

@@ -17,6 +17,7 @@ package cc
 import (
 	"android/soong/android"
 	"android/soong/cc/config"
+	"github.com/google/blueprint/proptools"
 )
 
 func init() {
@@ -120,5 +121,16 @@ func NewFuzz(hod android.HostOrDeviceSupported) *Module {
 		ctx.AppendProperties(&disableDarwinAndLinuxBionic)
 	})
 
+	// Statically link the STL. This allows fuzz target deployment to not have to
+	// include the STL.
+	android.AddLoadHook(module, func(ctx android.LoadHookContext) {
+		staticStlLinkage := struct {
+			Stl *string
+		}{}
+
+		staticStlLinkage.Stl = proptools.StringPtr("libc++_static")
+		ctx.AppendProperties(&staticStlLinkage)
+	})
+
 	return module
 }