Remove vulkan files from cmake build

cmake/CMakeLists.txt

 # Boilerplate.
 cmake_minimum_required (VERSION 3.1)   # First version with CMAKE_CXX_STANDARD.
 project (skimake)
 set (CMAKE_CXX_STANDARD 11)
 
 # Default to Release mode.  We're mainly targeting Skia users, not Skia developers.
 if (NOT CMAKE_BUILD_TYPE)
     set (CMAKE_BUILD_TYPE Release)
 endif ()
 
@@ skipping 77 matching lines @@
 # Make our ports choices.
 remove_srcs(
     ../src/*moz*   # We're probably not Mozilla.
     ../src/gpu/GrContextFactory.cpp                  # For internal testing only.
     ../src/gpu/gl/GrGLCreateNativeInterface_none.cpp
     ../src/gpu/gl/GrGLDefaultInterface_none.cpp
     ../src/gpu/gl/SkCreatePlatformGLContext*.cpp     # For internal testing only.
     ../src/gpu/gl/command_buffer/*
     ../src/gpu/gl/egl/*
     ../src/gpu/gl/iOS/*
+    ../src/gpu/vk/*
     ../src/opts/SkBitmapProcState_opts_none.cpp
     ../src/opts/SkBlitMask_opts_none.cpp
     ../src/opts/SkBlitRow_opts_none.cpp
     ../src/ports/SkFontMgr_empty_factory.cpp
     ../src/ports/SkGlobalInitialization_chromium.cpp
     ../src/ports/SkImageDecoder_empty.cpp
     ../src/ports/SkImageGenerator_none.cpp
     ../src/ports/SkTLS_none.cpp)
 
 if (WIN32)
@@ skipping 213 matching lines @@
         file (APPEND ${skia_h_path} "#include \"${filename_component}\"\n")
       endif ()
     endforeach()
   endif()
 endforeach()
 file(APPEND ${skia_h_path} "\n#endif  // skia_DEFINED\n")
 
 # Now build a simple example app that uses Skia via libskia.so.
 add_executable(example example.cpp)
 target_link_libraries(example skia ${OPENGL_LIBRARIES})