fileapi: target info misses framework search paths
Consider the following example
Any generator on Mac OS will, in one way or another, specify the framework search path pointing to the Qt installation (using
-iframework option in Ninja & Makefiles or
FRAMEWORK_SEARCH_PATHS property in Xcode project). However
target is missing it completely. For now I have to imitate
cmLocalGenerator::GetIncludeFlags's behaviour in my code.