Remove -nostdlib

-nostdlib wasn't working as intended, because the build system was
passing -nodefaultlibs and then adding back most of the default
libraries manually.  It is now passing -nostdlib++, which was
causing libunwind to no longer link against libc.

Test: m checkbuild
Change-Id: I172c73e0502527b82ed4e094e080f1c653b73cd0
diff --git a/Android.bp b/Android.bp
index 9fabe3c..d112d6b 100644
--- a/Android.bp
+++ b/Android.bp
@@ -398,10 +398,6 @@
     },
 
     target: {
-        linux_glibc: {
-            // Remove dependencies on libgcc
-            ldflags: ["-nostdlib"],
-        },
         linux_bionic: {
             enabled: true,
         },