Fix arc4 compilation debian

[endaco]

Purpose

This Pull Request addresses and fixes various compilation issues on Debian 12 systems related to ARC4 and time/date functions

Changes Made

• arc4.c:

  • Applied corrections to ensure compilation compatibility with GCC on Debian 12.

• settime.c:

  • Adjustments made to improve precision in setting the system time.

• setdate.c:

  • Updated the logic for setting the dates.

• dattime3.c:

  • Improved date and time handling.

• firebird.c:

  • Modified the connection routine to use hb_snprintf to prevent possible buffer overflow issues.

Impact

These changes ensure that the code compiles correctly and operates smoothly on Debian 12 systems.

Tests Conducted

• Successfully compiled the project on Debian 12.
• Ran existing unit tests to ensure no regressions.
• Conducted functional tests to validate changes in time and date functions and integration with Firebird.