[BUG] regex.zc ifdef oddity

[borup3]

Describe the bug
Some complex ifdefs to end up with the same output in all cases.

include "std/third-party/tre/include/tre.h"

raw {
    // Include TRE implementation for static linking
    #if defined(_WIN32) && defined(_MSC_VER)
      // Windows (MSVC) needs full source inclusion as linking .o files is hard
      #include "std/third-party/tre/tre_full.c"
    #else
      // Linux/macOS/MinGW: Also include source to ensure linking works without precompiled libs
      #include "std/third-party/tre/tre_full.c"
    #endif
}