WIP: Address getenv() issues#2019

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dscho wants to merge 13 commits intogit-for-windows:mainfrom

dscho:getenv-fixes

Commits on Jan 17, 2019

fixup! tests: include detailed trace logs with --write-junit-xml upon failure
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DEBUG: invalidate getenv() calls when the next one is called
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DEBUG2: help diagnosing issues
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WORK-AROUND: force `fmt_ident(...)` to succeed
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DEBUG: only test on Windows
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TODO: left-over bit from env conversion
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get_super_prefix(): copy getenv() result

peff
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commit: copy saved getenv() result

peff
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config: make a copy of $GIT_CONFIG string

peff
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init: make a copy of $GIT_DIR string

peff
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merge-recursive: copy $GITHEAD strings

peff
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builtin_diff(): read $GIT_DIFF_OPTS closer to use

peff
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TO-SPLIT
dscho
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