Revert "Fix volantis boot."

Bug: http://b/20065774
This reverts commit 76e1cbca75e9fdaf7a7943f2c58e65433b283f4a.

(cherry picked from commit 7c2c01d681d7f2faa256a263996a35ac3edc94b3)
diff --git a/libc/Android.mk b/libc/Android.mk
index 4a20b3f..c8bdb06 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -1388,8 +1388,7 @@
 # We'd really like to do this for all architectures, but since this wasn't done
 # before, these symbols must continue to be exported on LP32 for binary
 # compatibility.
-# TODO: disabled for http://b/20065774.
-#LOCAL_LDFLAGS_64 := -Wl,--exclude-libs,libgcc.a
+LOCAL_LDFLAGS_64 := -Wl,--exclude-libs,libgcc.a
 
 # TODO: This is to work around b/19059885. Remove after root cause is fixed
 LOCAL_LDFLAGS_arm := -Wl,--hash-style=sysv