Remove -Werror

-Werror just doesn't work because it changes too much
between compiler versions.
diff --git a/Makefile b/Makefile
index d4eed71..543d9e8 100644
--- a/Makefile
+++ b/Makefile
@@ -30,7 +30,7 @@
 HOSTCC = gcc
 DEFINES += -D_GNU_SOURCE
 CCOPTS = -O2
-WFLAGS := -Wall -Wstrict-prototypes -Werror -Wmissing-prototypes
+WFLAGS := -Wall -Wstrict-prototypes  -Wmissing-prototypes
 WFLAGS += -Wmissing-declarations -Wold-style-definition
 
 CFLAGS = $(WFLAGS) $(CCOPTS) -I../include $(DEFINES)