[gn build] Port af79372

Author: llvmgnsyncbot

llvm/utils/gn/secondary/clang-tools-extra/clang-tidy/modernize/BUILD.gn

@@ -50,6 +50,7 @@ static_library("modernize") {
     "UseNullptrCheck.cpp",
     "UseOverrideCheck.cpp",
     "UseStartsEndsWithCheck.cpp",
+    "UseStdFormatCheck.cpp",
     "UseStdNumbersCheck.cpp",
     "UseStdPrintCheck.cpp",
     "UseTrailingReturnTypeCheck.cpp",