This is already done this way in our stdlib.h. It is needed by GCC 13 C++ headers. The problem happens like this:
- telnet/precomp.h includes fstream from GCC
- fstream includes pthread.h from GCC
- pthread.h includes process.h from ReactOS
- process.h defines _CRT_TERMINATE_DEFINED, but doesn't declare _Exit
- fstream includes cstdlib from GCC
- cstdlib includes stdlib.h from GCC (#include_next)
- stdlib.h doesn't declare _Exit, because _CRT_TERMINATE_DEFINED is defined
- cstdlib uses _Exit
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