Add OMX IL FLAC encoder library

Bug 5525503

Add the software FLAC encoder OMX IL wrapper to the build.

Change-Id: Iac69558088934e0db41e9cc7fa3fab7e72348568
diff --git a/target/product/core.mk b/target/product/core.mk
index 0572e2d..c8914e0 100644
--- a/target/product/core.mk
+++ b/target/product/core.mk
@@ -97,6 +97,7 @@
     libstagefright_soft_amrdec \
     libstagefright_soft_amrnbenc \
     libstagefright_soft_amrwbenc \
+    libstagefright_soft_flacenc \
     libstagefright_soft_g711dec \
     libstagefright_soft_h264dec \
     libstagefright_soft_h264enc \