[Clang] Fix CLANG_TOOLCHAIN_PROGRAM_TIMEOUT logic

PR #102521, which landed as 1ea0865, implemented
`CLANG_TOOLCHAIN_PROGRAM_TIMEOUT`, but the logic is obviously wrong.
If the user-specified value is negative, it should become zero to mean
infinite.  Otherwise, it should be left as is.  Thus, use `std::max`
not `std::min`.  This obvious fixup doesn't seem worth another pull
request.

Author: jdenny-ornl

clang/lib/Driver/ToolChain.cpp

@@ -126,7 +126,7 @@ ToolChain::executeToolChainProgram(StringRef Executable) const {
                                      "CLANG_TOOLCHAIN_PROGRAM_TIMEOUT expected "
                                      "an integer, got '" +
                                          *Str + "'");
-    SecondsToWait = std::min(SecondsToWait, 0); // infinite
+    SecondsToWait = std::max(SecondsToWait, 0); // infinite
   }
   if (llvm::sys::ExecuteAndWait(Executable, {}, {}, Redirects, SecondsToWait,
                                 /*MemoryLimit=*/0, &ErrorMessage))