[yelp] Enable compiler warnings for libyelp

[David King <davidk src gnome org>]

commit d7fddfed6eff3f0274482f69827d9d93914da480
Author: David King <amigadave amigadave com>
Date:   Mon Feb 9 15:43:00 2015 +0000

    Enable compiler warnings for libyelp

 libyelp/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/libyelp/Makefile.am b/libyelp/Makefile.am
index 75606e0..5ebf22d 100644
--- a/libyelp/Makefile.am
+++ b/libyelp/Makefile.am
@@ -47,6 +47,7 @@ EXTRA_DIST += yelp-bz2-decompressor.c
 endif
 
 libyelp_la_CFLAGS =                             \
+       $(WARN_CFLAGS)                          \
        $(YELP_CFLAGS)                          \
        -Wno-deprecated-declarations            \
        -DDATADIR=\""$(datadir)"\"              \