Fix superenv arch flag handling

Fixes #21943.
This is a backreference, not an embedded NUL
appledoc v2.2

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casperjs 1.0.3

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cpanminus 1.6940

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cppcheck 1.61

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css-crush v1.11

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cyassl v2.7.2

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dub v0.9.17

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logentries v1.2.14

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mackup 0.5

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matlab2tikz 0.4.1

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Perl-Build 1.04

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pngquant 1.8.4

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svtplay-dl 0.9.2013.08.10

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voltdb 3.5.0.1

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watchman v2.9

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zsh-syntax-highlighting 0.2.0

Closes #21945.

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