[llvm] [flang][runtime] Use dlsym to access char** environ on FreeBSD (PR #158477)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- flang-rt/lib/runtime/environment.cpp
``````````

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``````````diff
diff --git a/flang-rt/lib/runtime/environment.cpp b/flang-rt/lib/runtime/environment.cpp
index f74fabce8..cb247bec8 100644
--- a/flang-rt/lib/runtime/environment.cpp
+++ b/flang-rt/lib/runtime/environment.cpp
@@ -109,7 +109,7 @@ void ExecutionEnvironment::Configure(int ac, const char *av[],
 #ifdef _WIN32
   envp = _environ;
 #elif defined(__FreeBSD__)
-  envp = *reinterpret_cast<char***>(dlsym(RTLD_DEFAULT, "environ"));
+  envp = *reinterpret_cast<char ***>(dlsym(RTLD_DEFAULT, "environ"));
 #else
   envp = environ;
 #endif

``````````

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https://github.com/llvm/llvm-project/pull/158477