[CMake] Probably a bug in FindIce.cmake

[Ravi Kumar Singh]

In FindIce.cmake, when searching for libraries, there are lots of if
conditionals with quotes around their arguments. With changes in cmake 3.1
(policy CMP0054), they are preventing the module to find libraries
successfully. See lines 285, 292, 293, 299 in Modules/FindIce.cmake

I am new to cmake thus have little experience with cmake language, so I am
not sure if its a bug, but removing the quotes made it find ice and
libraries properly.
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