Remove libportable from core_base.mk.

(cherry picked from commit 4e8c6991e534fdb5901c6d31d7181a0d071317f4)

Change-Id: Icefe7dccbca87798d4ec0761bf90aa169253839e
diff --git a/target/product/core_base.mk b/target/product/core_base.mk
index 43080e2..f14e53d 100644
--- a/target/product/core_base.mk
+++ b/target/product/core_base.mk
@@ -34,7 +34,6 @@
     libgabi++ \
     libmdnssd \
     libnfc_ndef \
-    libportable \
     libpowermanager \
     libspeexresampler \
     libstagefright_soft_aacdec \