message: fix(runtime-c-api) Use `#if defined` instead of `#ifdef`.
diff: @@ -13,20 +13,20 @@ fn main() {
  out_wasmer_header_file.push("wasmer");
  const WASMER_PRE_HEADER: &str = r#"
  -#ifndef WASMER_H_MACROS
  +#if !defined(WASMER_H_MACROS)
  #define WASMER_H_MACROS
  -#if MSVC
  -#ifdef _M_AMD64
  + #if defined(MSVC)
  + #if defined(_M_AMD64)
  #define ARCH_X86_64
  #endif
  #endif
  -#if GCC
  -#ifdef __x86_64__
  + #if defined(GCC)
  + #if defined(__x86_64__)
  #define ARCH_X86_64
  #endif
  #endif
  -#endif // WASMER_H_MACROS
  +#endif
  "#;
  // Generate the C bindings in the `OUT_DIR`.
  out_wasmer_header_file.set_extension("h");
  