• src/sbbs3/str_util.c str_util.h upgrade_to_v319.c

    From Rob Swindell (on Windows 11)@VERT to Git commit to main/sbbs/master on Sat Nov 8 19:48:59 2025
    https://gitlab.synchro.net/main/sbbs/-/commit/6f71897b0a5e37dea4a1feca
    Modified Files:
    src/sbbs3/str_util.c str_util.h upgrade_to_v319.c
    Log Message:
    Eliminate "hex-plus" number concept from sbbs v3.2x, unused since v3.18

    Move hptoi() to upgrade_to_v319.c, since it's still needed to parse the
    old filebases.

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