[bazel] Fix the build after 27b2d7d

Author: d0k

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

@@ -2042,6 +2042,7 @@ cc_library(
     name = "install_api",
     srcs = glob([
         "lib/InstallAPI/*.cpp",
+        "lib/InstallAPI/*.h",
     ]),
     hdrs = glob([
         "include/clang/InstallAPI/*.h",