Silence CMake Policy 0063 warning (#790)

Summary: - When google benchmark is used as a submodule in a parent projects whose min CMake version is 3.3.2 or later, the google benchmark `CMakeLists.txt` triggers a warning regarding CMake policy 0063: ``` CMake Warning (dev) at tests/googlebenchmark/src/CMakeLists.txt:19 (add_library): Policy CMP0063 is not set: Honor visibility properties for all target types. Run "cmake --help-policy CMP0063" for policy details. Use the cmake_policy command to set the policy and suppress this warning. Target "benchmark" of type "STATIC_LIBRARY" has the following visibility properties set for CXX: CXX_VISIBILITY_PRESET VISIBILITY_INLINES_HIDDEN For compatibility CMake is not honoring them for this target. This warning is for project developers. Use -Wno-dev to suppress it. ``` - Set CMake Policy 0063 to NEW if the policy is available. This will not affect parent projects who include benchmark but do not have a CMake min version of 3.3.2 or later, i.e. when this policy is introduced.

Silence CMake Policy 0063 warning (#790)
3bc802e4 · Joseph Loser · Dominic Hamon · 6a5c379c · 3bc802e4
Commit 3bc802e4 authored Apr 05, 2019 by Joseph Loser Committed by Dominic Hamon Apr 05, 2019
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--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,6 +5,7 @@ foreach(p
    CMP0054 # CMake 3.1
    CMP0056 # export EXE_LINKER_FLAGS to try_run
    CMP0057 # Support no if() IN_LIST operator
+    CMP0063 # Honor visibility properties for all targets
    )
  if(POLICY ${p})
    cmake_policy(SET ${p} NEW)