message: Remove CMake's force flags
diff: @@ -3,20 +3,20 @@ execute_process(COMMAND git submodule update --init --recursive
  )
  -set(SPIRV_HEADERS_SKIP_EXAMPLES ON CACHE BOOL "Skip SPIRV-Headers examples" FORCE)
  +set(SPIRV_HEADERS_SKIP_EXAMPLES ON CACHE BOOL "Skip SPIRV-Headers examples")
  add_subdirectory(SPIRV-Headers)
  -set(SKIP_SPIRV_TOOLS_INSTALL ON CACHE BOOL "Skip SPIRV-Tools install" FORCE)
  -set(SPIRV_SKIP_TESTS ON CACHE BOOL "Skip SPIRV-Tools tests" FORCE)
  -set(SPIRV_SKIP_EXECUTABLES ON CACHE BOOL "Skip SPIRV-Tools executable build" FORCE)
  +set(SKIP_SPIRV_TOOLS_INSTALL ON CACHE BOOL "Skip SPIRV-Tools install")
  +set(SPIRV_SKIP_TESTS ON CACHE BOOL "Skip SPIRV-Tools tests")
  +set(SPIRV_SKIP_EXECUTABLES ON CACHE BOOL "Skip SPIRV-Tools executable build")
  add_subdirectory(SPIRV-Tools)
  -set(SKIP_GLSLANG_INSTALL ON CACHE BOOL "Skip glslang install" FORCE)
  -set(ENABLE_SPVREMAPPER OFF CACHE BOOL "SPVRemapper is a spirv compression experimental library" FORCE)
  -set(ENABLE_GLSLANG_BINARIES OFF CACHE BOOL "Build glslangValidator and spirv-remap?" FORCE)
  -set(BUILD_TESTING OFF CACHE BOOL "Enable glslang build testing?" FORCE)
  +set(SKIP_GLSLANG_INSTALL ON CACHE BOOL "Skip glslang install")
  +set(ENABLE_SPVREMAPPER OFF CACHE BOOL "SPVRemapper is a spirv compression experimental library")
  +set(ENABLE_GLSLANG_BINARIES OFF CACHE BOOL "Build glslangValidator and spirv-remap?")
  +set(BUILD_TESTING OFF CACHE BOOL "Enable glslang build testing?")
  add_subdirectory(glslang)
  -set(SHADERC_SKIP_TESTS ON CACHE BOOL "Skip shaderc tests?" FORCE)
  -set(SHADERC_SKIP_INSTALL ON CACHE BOOL "Install shaderc?" FORCE)
  +set(SHADERC_SKIP_TESTS ON CACHE BOOL "Skip shaderc tests?")
  +set(SHADERC_SKIP_INSTALL ON CACHE BOOL "Install shaderc?")
  # if it doesn't work without the `touch` on Linux, then fetch the latest submodule head of shaderc and try again
  # https://github.com/google/shaderc/issues/568
  if (UNIX)
  