[CMake] Miscellaneous issues in WebKitFeatures.cmake
https://bugs.webkit.org/show_bug.cgi?id=143636
Reviewed by Martin Robinson.
Rename _WEBKIT_AVAILABLE_OPTIONS_INITIALVALUE_ variables to
_WEBKIT_AVAILABLE_OPTIONS_INITIAL_VALUE_
Rename _WEBKIT_AVAILABLE_OPTIONS_ISPUBLIC_ variables to
_WEBKIT_AVAILABLE_OPTIONS_IS_PUBLIC_
Rename _SHOULD_PRINT_POINTS to _SHOULD_PRINT_DOTS
Update USE_SYSTEM_MALLOC description to not mention TCmalloc
Fix ENABLE_TOUCH_SLIDER so that it can be used
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* Source/cmake/WebKitFeatures.cmake:
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@182664
268f45cc-cd09-0410-ab3c-
d52691b4dbfc