Change WARN to NOTICE like the SHA3 pattern uses

Author: kaleb-himes

configure.ac

@@ -4544,7 +4544,7 @@ if test "$ENABLED_MLKEM" != "no"
 then
     if test "$ENABLED_SHAKE128" = "no"
     then
-        AC_MSG_WARN([MLKEM enabled (not explicitly disabled); overriding --disable-shake128 to enable SHAKE128])
+        AC_MSG_NOTICE([MLKEM enabled (not explicitly disabled); overriding --disable-shake128 to enable SHAKE128])
         ENABLED_SHAKE128=yes
         enable_shake128=yes
     fi
@@ -4562,7 +4562,7 @@ if test "$ENABLED_MLKEM" != "no"
 then
     if test "$ENABLED_SHAKE256" = "no"
     then
-        AC_MSG_WARN([MLKEM enabled (not explicitly disabled); overriding --disable-shake256 to enable SHAKE256])
+        AC_MSG_NOTICE([MLKEM enabled (not explicitly disabled); overriding --disable-shake256 to enable SHAKE256])
         ENABLED_SHAKE256=yes
         enable_shake256=yes
     fi