SHA256 uses ForceZero now too

Author: JacobBarthelmeh

wolfssl/wolfcrypt/settings.h

@@ -2919,7 +2919,7 @@ extern void uITRON4_free(void *p) ;
 #if defined(WOLFCRYPT_ONLY) && defined(NO_AES) && !defined(WOLFSSL_SHA384) && \
     !defined(WOLFSSL_SHA512) && defined(WC_NO_RNG) && \
     !defined(WOLFSSL_SP_MATH) && !defined(WOLFSSL_SP_MATH_ALL) \
-    && !defined(USE_FAST_MATH)
+    && !defined(USE_FAST_MATH) && defined(NO_SHA256)
     #undef  WOLFSSL_NO_FORCE_ZERO
     #define WOLFSSL_NO_FORCE_ZERO
 #endif