[libc] Add CMake Target for Dl_info.h Header (#156195)

Otherwise when installing the dlfcn.h header, there is a missing
reference to Dl_info.h, which causes compilation failures in some cases,
notably libunwind.

libc/include/CMakeLists.txt

diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index 74fcea0..8fd37b0 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -70,6 +70,7 @@
   dlfcn.h
   DEPENDS
     .llvm_libc_common_h
+    .llvm-libc-types.dl_info
 )
 
 add_header_macro(

libc/include/llvm-libc-types/CMakeLists.txt

diff --git a/libc/include/llvm-libc-types/CMakeLists.txt b/libc/include/llvm-libc-types/CMakeLists.txt
index 451beae..fe9e4e3 100644
--- a/libc/include/llvm-libc-types/CMakeLists.txt
+++ b/libc/include/llvm-libc-types/CMakeLists.txt
@@ -72,6 +72,7 @@
 add_header(suseconds_t HDR suseconds_t.h)
 add_header(struct_dirent HDR struct_dirent.h DEPENDS .ino_t .off_t)
 add_header(struct_dl_phdr_info HDR struct_dl_phdr_info.h DEPENDS .size_t libc.include.llvm-libc-macros.link_macros)
+add_header(dl_info HDR Dl_info.h)
 add_header(struct_f_owner_ex HDR struct_f_owner_ex.h DEPENDS .pid_t)
 add_header(struct_flock HDR struct_flock.h DEPENDS .off_t .pid_t)
 add_header(struct_flock64 HDR struct_flock64.h DEPENDS .off64_t .pid_t)