[bazel] Add missing file to textual_hdrs in //clang:basic (NFC)

Author: slackito

utils/bazel/llvm-project-overlay/clang/BUILD.bazel

@@ -712,6 +712,7 @@ cc_library(
         "include/clang/Basic/DiagnosticFrontendKinds.inc",
         "include/clang/Basic/DiagnosticGroups.inc",
         "include/clang/Basic/DiagnosticIndexName.inc",
+        "include/clang/Basic/DiagnosticInstallAPIKinds.inc",
         "include/clang/Basic/DiagnosticLexKinds.inc",
         "include/clang/Basic/DiagnosticParseKinds.inc",
         "include/clang/Basic/DiagnosticRefactoringKinds.inc",