Remove dead subdirs directive.

I removed the bionic/scudo directory a while ago, but I must have
missed removing the subdirs from the Android.bp file.

Test: Builds.
Change-Id: I3e2a1f42b91273a566e587e923c7c3889a71ed17
diff --git a/libc/Android.bp b/libc/Android.bp
index f132669..1c4876e 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -2615,10 +2615,6 @@
     stl: "none",
 }
 
-subdirs = [
-    "bionic/scudo",
-]
-
 // Export kernel uapi headers to be used in the musl sysroot.
 // Also include the execinfo headers for the libexecinfo and the
 // b64 headers for libb64 embedded in musl libc.