Revert "cmTarget: mark 2 file-local functions as static"

This reverts commit 04f98dca2e7323854583bf1eee2bed0776e62c24.

"/home/kitware/Dashboards/My Tests/CMakeSun/Source/cmTarget.cxx", line 5294: Error: Reference to static compatibilityAgree(CompatibleType, bool) not allowed in template checkInterfacePropertyCompatibility<bool>(const cmTarget*, const std::string &, const std::string &, const char*, CompatibleType, bool*), try using -features=tmplrefstatic.
"/home/kitware/Dashboards/My Tests/CMakeSun/Source/cmTarget.cxx", line 5403:     Where: While instantiating "checkInterfacePropertyCompatibility<bool>(const cmTarget*, const std::string &, const std::string &, const char*, CompatibleType, bool*)".
"/home/kitware/Dashboards/My Tests/CMakeSun/Source/cmTarget.cxx", line 5403:     Where: Instantiated from non-template code.
"/home/kitware/Dashboards/My Tests/CMakeSun/Source/cmTarget.cxx", line 5327: Error: Reference to static compatibilityAgree(CompatibleType, bool) not allowed in template checkInterfacePropertyCompatibility<bool>(const cmTarget*, const std::string &, const std::string &, const char*, CompatibleType, bool*), try using -features=tmplrefstatic.
"/home/kitware/Dashboards/My Tests/CMakeSun/Source/cmTarget.cxx", line 5403:     Where: While instantiating "checkInterfacePropertyCompatibility<bool>(const cmTarget*, const std::string &, const std::string &, const char*, CompatibleType, bool*)".
"/home/kitware/Dashboards/My Tests/CMakeSun/Source/cmTarget.cxx", line 5403:     Where: Instantiated from non-template code.
"/home/kitware/Dashboards/My Tests/CMakeSun/Source/cmTarget.cxx", line 5361: Error: Reference to static compatibilityAgree(CompatibleType, bool) not allowed in template checkInterfacePropertyCompatibility<bool>(const cmTarget*, const std::string &, const std::string &, const char*, CompatibleType, bool*), try using -features=tmplrefstatic.
"/home/kitware/Dashboards/My Tests/CMakeSun/Source/cmTarget.cxx", line 5403:     Where: While instantiating "checkInterfacePropertyCompatibility<bool>(const cmTarget*, const std::string &, const std::string &, const char*, CompatibleType, bool*)".
"/home/kitware/Dashboards/My Tests/CMakeSun/Source/cmTarget.cxx", line 5403:     Where: Instantiated from non-template code.
Merge topic 'local-static' into next

4781525e Revert "cmTarget: mark 2 file-local functions as static"