Memory allocation for cmdline in the rtl on macOS
## Summary
Memory allocation for cmdline in the rtl on MacOS is inconsistent and can lead to crashes
## System Information
MacOS 14.7
## Problem description
rtl/inc/systemh.inc initialises cmdline to nil with var CmdLine:Pchar=nil;
rtl/bsd/system.pp calls reallocmem(cmdline, ...)
rtl/inc/system.inc calls sysfreemem(cmdline)
The calls to reallocmem and sysfreemem are inconsistent and this will lead to a crash (in sysfreemem) at program exit, if e.g. the memory manager at the time of realloc is the C memory manager.
## Possible fixes
* call sysreallocmem(cmdline, ...) in rtl/bsd/system.pp rather than reallocmem(cmdline, ...)
* check to see if sysmem calls are used on other platforms for the (global) cmdline variable
issue