Synthesize Windows temp env vars#135
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LINK.EXE expects Windows-style TMP/TEMP variables when choosing a scratch path for CVTRES. On macOS wibo only inherited TMPDIR, so the linker called GetTempFileNameW with a null path and later crashed the host in WideCharToMultiByte while converting that null pointer. Expose TMP and TEMP from TMPDIR with a /tmp fallback, convert them to Windows paths in the environment APIs, and harden the ANSI/wide conversion shims so invalid guest pointers return ERROR_INVALID_PARAMETER instead of segfaulting wibo. Add regression coverage for the synthesized temp variables and null conversion inputs.
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LINK.EXE expects Windows-style TMP/TEMP variables when choosing a scratch path for CVTRES. On macOS wibo only inherited TMPDIR, so the linker called GetTempFileNameW with a null path and later crashed the host in WideCharToMultiByte while converting that null pointer.
Expose TMP and TEMP from TMPDIR with a /tmp fallback, convert them to Windows paths in the environment APIs, and harden the ANSI/wide conversion shims so invalid guest pointers return ERROR_INVALID_PARAMETER instead of segfaulting wibo. Add regression coverage for the synthesized temp variables and null conversion inputs.