Remove use of NO_NATIVESHA1 (#1370)

Author: Carti-it

NBitcoin/BouncyCastle/crypto/digests/Sha1Digest.cs

@@ -100,13 +100,8 @@ public static byte[] RIPEMD160(byte[] data, int offset, int count)
 		}
 		public static byte[] SHA1(byte[] data, int offset, int count)
 		{
-#if NO_NATIVESHA1
-			var sha1 = new Sha1Digest();
-			sha1.BlockUpdate(data, offset, count);
-			byte[] rv = new byte[20];
-			sha1.DoFinal(rv, 0);
-			return rv;
-#elif NET10_0_OR_GREATER
+
+#if NET10_0_OR_GREATER
 			return System.Security.Cryptography.SHA1.HashData(data.AsSpan(offset, count));
 #else
 			using (var sha1 = System.Security.Cryptography.SHA1.Create())

NBitcoin/Crypto/Hashes.cs

@@ -67,7 +67,6 @@
     <Compile Include="BouncyCastle\util\Arrays.cs"></Compile>
     <Compile Include="BouncyCastle\util\Platform.cs"></Compile>
     <Compile Include="BouncyCastle\crypto\digests\RipeMD160Digest.cs"></Compile>
-    <Compile Include="BouncyCastle\crypto\digests\Sha1Digest.cs"></Compile>
     <Compile Include="BouncyCastle\crypto\digests\Sha256Digest.cs"></Compile>
     <Compile Include="BouncyCastle\crypto\digests\KeccakDigest.cs"></Compile>
     <Compile Include="BouncyCastle\crypto\digests\Sha3Digest.cs"></Compile>