Merge pull request #8754 from erg/build-script-impl-version-remove

utils/build-script-impl: Remove dead code.

Author: erg

utils/build-script-impl

@@ -173,11 +173,6 @@ KNOWN_SETTINGS=(
     native-llvm-tools-path      ""               "directory that contains LLVM tools that are executable on the build machine"
     native-clang-tools-path     ""               "directory that contains Clang tools that are executable on the build machine"
     native-swift-tools-path     ""               "directory that contains Swift tools that are executable on the build machine"
-    compiler-vendor             "none"           "compiler vendor name [none,apple]"
-    clang-user-visible-version  "4.0.0"          "user-visible version of the embedded Clang and LLVM compilers"
-    swift-user-visible-version  "3.1"            "user-visible version of the Swift language"
-    swift-compiler-version      ""               "string that indicates a compiler version for Swift"
-    clang-compiler-version      ""               "string that indicates a compiler version for Clang"
     embed-bitcode-section       "0"              "embed an LLVM bitcode section in stdlib/overlay binaries for supported platforms"
     darwin-crash-reporter-client ""              "whether to enable CrashReporter integration"
     darwin-stdlib-install-name-dir ""            "the directory of the install_name for standard library dylibs"