In external_rng tests, disable the entropy module

The point of having an external RNG is that you can disable all
built-in RNG functionality: both the entropy part and the DRBG part.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 91d457a..afc7685 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -1014,6 +1014,9 @@
     scripts/config.py full
     scripts/config.py unset MBEDTLS_USE_PSA_CRYPTO
     scripts/config.py set MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG
+    scripts/config.py unset MBEDTLS_ENTROPY_C
+    scripts/config.py unset MBEDTLS_ENTROPY_NV_SEED
+    scripts/config.py unset MBEDTLS_PLATFORM_NV_SEED_ALT
     scripts/config.py unset MBEDTLS_CTR_DRBG_C
     scripts/config.py unset MBEDTLS_HMAC_DRBG_C
     scripts/config.py unset MBEDTLS_ECDSA_DETERMINISTIC # requires HMAC_DRBG
@@ -1034,6 +1037,9 @@
     msg "build: PSA_CRYPTO_EXTERNAL_RNG minus *_DRBG, PSA crypto in TLS"
     scripts/config.py full
     scripts/config.py set MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG
+    scripts/config.py unset MBEDTLS_ENTROPY_C
+    scripts/config.py unset MBEDTLS_ENTROPY_NV_SEED
+    scripts/config.py unset MBEDTLS_PLATFORM_NV_SEED_ALT
     scripts/config.py unset MBEDTLS_CTR_DRBG_C
     scripts/config.py unset MBEDTLS_HMAC_DRBG_C
     scripts/config.py unset MBEDTLS_ECDSA_DETERMINISTIC # requires HMAC_DRBG