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Updated docs with recommendation to use CheckSymbolExists instead.

Stephen Sorley requested to merge stephen-sorley/cmake:docs-function-exists into master

This MR relates to the following mailing list thread:

https://cmake.org/pipermail/cmake-developers/2017-January/029758.html

The main motivation is to try to steer users toward using CheckSymbolExists instead of CheckFunctionExists. This is necessary because CheckFunctionExists has significant issues that make it inaccurate and susceptible to breaking after internal changes to system libraries.

Any style suggestions you have are welcome, this is the first time I've edited the CMake docs.

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