ci: Add job wihtout <stdio.h>

Author: real-or-random

.github/workflows/ci.yml

@@ -80,7 +80,7 @@ jobs:
           - env_vars: {                    RECOVERY: 'yes',              SCHNORRSIG: 'yes' }
           - env_vars: { CTIMETESTS: 'no',  RECOVERY: 'yes', ECDH: 'yes', SCHNORRSIG: 'yes', CPPFLAGS: '-DVERIFY' }
           - env_vars: { BUILD: 'distcheck', WITH_VALGRIND: 'no', CTIMETESTS: 'no', BENCH: 'no' }
-          - env_vars: { CPPFLAGS: '-DDETERMINISTIC' }
+          - env_vars: {                    RECOVERY: 'yes', ECDH: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes', CPPFLAGS: '-DDETERMINISTIC -DSECP256K1_HAVE_STDIO_H=0' }
           - env_vars: { CFLAGS: '-O0', CTIMETESTS: 'no' }
           - env_vars: { CFLAGS: '-O1',     RECOVERY: 'yes', ECDH: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes' }
           - env_vars: { ECMULTGENPRECISION: 2, ECMULTWINDOW: 2 }