[clang] [SystemZ][z/OS] Add guard for dl_info and dladdr (PR #75637)

[Fanbo Meng via cfe-commits]

================
@@ -125,21 +126,28 @@ const std::string &CIndexer::getClangResourcesPath() {
 #elif defined(_AIX)
   getClangResourcesPathImplAIX(LibClangPath);
 #else
+  bool pathFound = false;
----------------
fanbo-meng wrote:

nit: Variables should start with upper case

https://github.com/llvm/llvm-project/pull/75637