Temporary check that errors really make the build fail

crypto_kem/kyber768/clean/Makefile.Microsoft_nmake

@@ -2,7 +2,7 @@ LIB=libkyber768_clean.lib
 
 OBJECTS=cbd.obj indcpa.obj kem.obj kex.obj ntt.obj poly.obj polyvec.obj precomp.obj reduce.obj verify.obj
 
-CFLAGS=/I ..\..\..\common /W1 /WX # FIXME: ideally would use /W4 instead of /W1, but too many failures in Kyber right now
+CFLAGS=/I ..\..\..\common /W4 /WX # FIXME: ideally would use /W4 instead of /W1, but too many failures in Kyber right now
 
 all: $(LIB)