all.deps, {sanitize,werror}.opts: add project - libosmo-gprs

Change-Id: I707e6ee0af6bcb940d5e77475bc581c0d07de6d7
diff --git a/werror.opts b/werror.opts
index af7c8dd..1e7079a 100644
--- a/werror.opts
+++ b/werror.opts
@@ -1,6 +1,7 @@
 libasn1c --enable-werror
 libosmo-abis --enable-werror
 libosmocore --enable-werror
+libosmo-gprs --enable-werror
 libosmo-netif --enable-werror
 libosmo-sccp --enable-werror
 libosmo-pfcp --enable-werror