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Update file copyright lines aftr running src/copyright.pl

Fix namespace corruption when brk call was added to align sbrk'ed memory.
Directly call the stub version (in crt0.o) instead of the C wrapper.

Make sure sbrk() return value is 8 byte aligned.  This makes sure the data
pointer returned to the user is also 8 byte aligned.  Once it's aligned it
will stay aligned unless the user calls sbrk() with a non-aligned size.

Reject requests larger than 2GB - 64KB.

Add malloc debugging and diagnostic facilities.

realloc: Try extending the block before allocating a new one.

Factored out certain defines and definitions to <libc/malloc.h>.

Add missing #include <libc/stubs.h>

check for malloc returning NULL in realloc()

update copyright dates

Avoid mixing signed and unsigned int (spotted by Mark Elbrecht).

make many variables non-global

import djgpp 2.02

import djgpp 2.00