Drop -Werror

Index: tools/kore-serve/conf/build.conf
--- tools/kore-serve/conf/build.conf.orig
+++ tools/kore-serve/conf/build.conf
@@ -2,7 +2,7 @@ single_binary=yes
 kore_source=../../
 kore_flavor=NOTLS=1
 
-cflags=-std=c99 -Werror
+cflags=-std=c99
 cflags=-Wall -Wmissing-declarations -Wshadow
 cflags=-Wstrict-prototypes -Wmissing-prototypes
 cflags=-Wpointer-arith -Wcast-qual -Wsign-compare
