fix: Conditionally compile base64 command for bb binary (#1851)

resolves #1850 

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- [ ] If the pull request requires a cryptography review (e.g.
cryptographic algorithm implementations) I have added the 'crypto' tag.
- [ ] I have reviewed my diff in github, line by line and removed
unexpected formatting changes, testing logs, or commented-out code.
- [ ] Every change is related to the PR description.
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circuits/cpp/barretenberg/cpp/src/barretenberg/bb/get_bytecode.hpp

@@ -6,6 +6,12 @@
  */
 inline std::vector<uint8_t> get_bytecode(const std::string& bytecodePath)
 {
+// base64 on mac is different from linux
+#ifdef __APPLE__
+    std::string command = "base64 -D -i " + bytecodePath + " | gunzip";
+#else
     std::string command = "base64 -d " + bytecodePath + " | gunzip";
+#endif
+
     return exec_pipe(command);
 }