[Support] Silence warnings when retrieving exported functions (#97905)

Since functions exported from DLLs are type-erased, before this patch I
was seeing the new Clang 19 warning `-Wcast-function-type-mismatch`.

This happens when building LLVM on Windows.

Following discussion in
593f708#commitcomment-143905744

Author: aganea

llvm/lib/Support/Windows/Process.inc

@@ -482,7 +482,8 @@ static RTL_OSVERSIONINFOEXW GetWindowsVer() {
     HMODULE hMod = ::GetModuleHandleW(L"ntdll.dll");
     assert(hMod);
 
-    auto getVer = (RtlGetVersionPtr)::GetProcAddress(hMod, "RtlGetVersion");
+    auto getVer =
+        (RtlGetVersionPtr)(void *)::GetProcAddress(hMod, "RtlGetVersion");
     assert(getVer);
 
     RTL_OSVERSIONINFOEXW info{};

llvm/lib/Support/Windows/Signals.inc

@@ -171,23 +171,27 @@ static bool load64BitDebugHelp(void) {
   HMODULE hLib =
       ::LoadLibraryExA("Dbghelp.dll", NULL, LOAD_LIBRARY_SEARCH_SYSTEM32);
   if (hLib) {
-    fMiniDumpWriteDump =
-        (fpMiniDumpWriteDump)::GetProcAddress(hLib, "MiniDumpWriteDump");
-    fStackWalk64 = (fpStackWalk64)::GetProcAddress(hLib, "StackWalk64");
-    fSymGetModuleBase64 =
-        (fpSymGetModuleBase64)::GetProcAddress(hLib, "SymGetModuleBase64");
-    fSymGetSymFromAddr64 =
-        (fpSymGetSymFromAddr64)::GetProcAddress(hLib, "SymGetSymFromAddr64");
-    fSymGetLineFromAddr64 =
-        (fpSymGetLineFromAddr64)::GetProcAddress(hLib, "SymGetLineFromAddr64");
-    fSymGetModuleInfo64 =
-        (fpSymGetModuleInfo64)::GetProcAddress(hLib, "SymGetModuleInfo64");
-    fSymFunctionTableAccess64 = (fpSymFunctionTableAccess64)::GetProcAddress(
-        hLib, "SymFunctionTableAccess64");
-    fSymSetOptions = (fpSymSetOptions)::GetProcAddress(hLib, "SymSetOptions");
-    fSymInitialize = (fpSymInitialize)::GetProcAddress(hLib, "SymInitialize");
-    fEnumerateLoadedModules = (fpEnumerateLoadedModules)::GetProcAddress(
-        hLib, "EnumerateLoadedModules64");
+    fMiniDumpWriteDump = (fpMiniDumpWriteDump)(void *)::GetProcAddress(
+        hLib, "MiniDumpWriteDump");
+    fStackWalk64 = (fpStackWalk64)(void *)::GetProcAddress(hLib, "StackWalk64");
+    fSymGetModuleBase64 = (fpSymGetModuleBase64)(void *)::GetProcAddress(
+        hLib, "SymGetModuleBase64");
+    fSymGetSymFromAddr64 = (fpSymGetSymFromAddr64)(void *)::GetProcAddress(
+        hLib, "SymGetSymFromAddr64");
+    fSymGetLineFromAddr64 = (fpSymGetLineFromAddr64)(void *)::GetProcAddress(
+        hLib, "SymGetLineFromAddr64");
+    fSymGetModuleInfo64 = (fpSymGetModuleInfo64)(void *)::GetProcAddress(
+        hLib, "SymGetModuleInfo64");
+    fSymFunctionTableAccess64 =
+        (fpSymFunctionTableAccess64)(void *)::GetProcAddress(
+            hLib, "SymFunctionTableAccess64");
+    fSymSetOptions =
+        (fpSymSetOptions)(void *)::GetProcAddress(hLib, "SymSetOptions");
+    fSymInitialize =
+        (fpSymInitialize)(void *)::GetProcAddress(hLib, "SymInitialize");
+    fEnumerateLoadedModules =
+        (fpEnumerateLoadedModules)(void *)::GetProcAddress(
+            hLib, "EnumerateLoadedModules64");
   }
   return isDebugHelpInitialized();
 }