TinyCC compatibility
====================
Header-defined helper functions are declared `static inline`, which gives them
internal linkage and avoids duplicate-definition errors with TinyCC.

On Windows, build-windows.ps1 now prefers:
    C:\tcc\tcc.exe

No compiler is required after bin\shen-c.exe has been built.

0.1.5: Removed dependency on strtoll, which is unavailable in TinyCC 0.9.27 Windows; Shen integer literals are parsed locally as int64_t. Also removed remaining Shen-integer-to-C-long narrowing conversions found in development/overwrite paths.
