[libc] Add proper alloca to OpenWatcom C library #2123
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Adds stack-overflow checking
allocato Open Watcom C library for ELKS. This allows alloca to be safely used in OWC projects without fear of stack overflow. Some tools in 8086-toolchain will be updated after this is committed.This version of alloca will check for stack remaining for the allocation, and if there isn't enough, the message "ALLOCA FAIL, INCREASE STACK" will be displayed, and alloca will return NULL.
Also adds __STK routine for OWC when using its -fstack-check option. This routine will cause a stack overflow check to be performed on every function entry.