small issue/typo with CMakeLists.txt config

[zbeekman]

False was miss-spelled when selecting the default build (unicode support?) so the CMake build was testing for UNICODE support by default. It still worked gracefully, but now it should not even try to detect and build with UNICODE support. Essentially there was a mismatch in the behavior and the selected options of the CMake build when the user tries to build for the first time.

PR incoming.

(Also silences a strange ifort warning across all build methods, “invalid use of $ character” Intel warning number 5142)