Ensure all tools are building with -Wall and -Werror

Added -Werror to CXXFLAGS

Change-Id: I686583a94d074d1c8bc46020dbbbbe2a212f5e9f
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/Makefile b/Makefile
index bacdef9..2c03541 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@
 LIB_OEM     = liboemhandler.so
 
 LDFLAGS += -rdynamic -ldl
-CXXFLAGS += -fPIC -Wall
+CXXFLAGS += -fPIC -Wall -Werror
 
 
 all:  $(LIB_OEM)