Revert "Use llvm-config.h in CIndexer.cpp instead of private header (#75928)"

This reverts commit e86a02c.

Author: abhina-sree

clang/tools/libclang/CIndexer.cpp

@@ -17,7 +17,7 @@
 #include "clang/Driver/Driver.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallString.h"
-#include "llvm/Config/llvm-config.h"
+#include "llvm/Config/config.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/MD5.h"
 #include "llvm/Support/Path.h"

llvm/include/llvm/Config/config.h.cmake

@@ -50,9 +50,15 @@
    don't. */
 #cmakedefine01 HAVE_DECL_STRERROR_S
 
+/* Define to 1 if you have the <dlfcn.h> header file. */
+#cmakedefine HAVE_DLFCN_H ${HAVE_DLFCN_H}
+
 /* Define if dlopen() is available on this platform. */
 #cmakedefine HAVE_DLOPEN ${HAVE_DLOPEN}
 
+/* Define if dladdr() is available on this platform. */
+#cmakedefine HAVE_DLADDR ${HAVE_DLADDR}
+
 /* Define to 1 if we can register EH frames on this platform. */
 #cmakedefine HAVE_REGISTER_FRAME ${HAVE_REGISTER_FRAME}
 

llvm/include/llvm/Config/llvm-config.h.cmake

@@ -198,10 +198,4 @@
 /* Define if plugins enabled */
 #cmakedefine LLVM_ENABLE_PLUGINS
 
-/* Define to 1 if you have the <dlfcn.h> header file. */
-#cmakedefine HAVE_DLFCN_H ${HAVE_DLFCN_H}
-
-/* Define if dladdr() is available on this platform. */
-#cmakedefine HAVE_DLADDR ${HAVE_DLADDR}
-
 #endif