Doesnt build under linux out of the box

[PlasmaHH]

cloned and ran cmake, got the error:

CMake Error at CMakeLists.txt:194 (if):
  if given arguments:

    "FALSE" "AND"

  Unknown arguments specified

Which I fixed for myself by putting the ${MSVC} on the mentioned line in double quotes, though I don't know if this would be the way it is intended, maybe MSVC should be detected and initialized properly instead.