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[CMake] NFC. An unset variable evaluates to false, so this else is unneeded

Authored by beanz on Jun 21 2016, 2:28 PM.

Description

[CMake] NFC. An unset variable evaluates to false, so this else is unneeded

This change is mostly to enable me to do some experimentation with building runtime libraries (See: D20992). It is harmless because unset variables evaluate to false in conditional expressions.

llvm-svn: 273320

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Committed
beanzJun 21 2016, 2:28 PM
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rG5a35e65ca94c: Trying to fix a buffer overflow that broke buildbot sanitizer-x86_64-linux…
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