On Windows %R is not a valid format specifier for os.date

[MasonGulu]

Describe the bug
This is a platform specific issue. On Linux calling os.date("%R") results in the correct formatting. On Windows calling the same snippet results in an error.

To Reproduce
Steps to reproduce the behavior:

1. Open lua prompt
2. Type in os.date("%R")
3. Compare behavior on Linux vs. Windows.

Expected behavior
No Crash.

Screenshots

Environment (please complete the following information):

• OS: Windows 10 / Kubuntu 22.04
• CraftOS-PC Version: 2.8.1
• Compiled from source? No

Additional context
Add any other context about the problem here.

[MasonGulu]

minerobber pointed out this relevant code
https://github.com/MCJack123/craftos2-lua/blob/lua-5.2/src/loslib.c#L28-L35

[MineRobber9000]

Specifically, if LUA_USE_POSIX is not defined, Lua restricts itself to a set of format specifiers that it knows will be available (%R is a C99 addition according to Jack so on a C89 system it wouldn't be available). Since Windows is not POSIX, %R isn't in the list of allowed format specifiers, and Lua responds with an error.