[upstream_utils] Remove patch that results in building with NDEBUG causing ODR issues (#8539)

Semiwrap / meson / robotpy define `NDEBUG` when building their software
in all modes, while `allwplib` only does it when building debug. This
causes the size of `DenseMap` to differ between the shared libraries
built here, and the extension modules built in `mostrobotpy`, causing
segfaults when you try to execute code that uses `DenseMap`. This is not
a problem with the robotpy code in `allwpilib`, because bazel uses the
exact same compiler flags when building the shared libraries and
pybind11 extensions.

upstream_utils/llvm_patches/0026-Unused-variable-in-release-mode.patch

@@ -0,0 +1,22 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Leander Schulten <Leander.Schulten@rwth-aachen.de>
+Date: Mon, 10 Jul 2023 00:53:43 +0200
+Subject: [PATCH 26/35] Unused variable in release mode
+
+---
+ llvm/include/llvm/ADT/DenseMap.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/llvm/include/llvm/ADT/DenseMap.h b/llvm/include/llvm/ADT/DenseMap.h
+index 4c852d2b142b4a3de76a1ce4049822cc449287f7..69ce7982d732887642c7f46163b753ee17be9b30 100644
+--- a/llvm/include/llvm/ADT/DenseMap.h
++++ b/llvm/include/llvm/ADT/DenseMap.h
+@@ -126,7 +126,7 @@ public:
+         P->getFirst() = EmptyKey;
+     } else {
+       const KeyT TombstoneKey = getTombstoneKey();
+-      unsigned NumEntries = getNumEntries();
++      [[maybe_unused]] unsigned NumEntries = getNumEntries();
+       for (BucketT *P = getBuckets(), *E = getBucketsEnd(); P != E; ++P) {
+         if (!KeyInfoT::isEqual(P->getFirst(), EmptyKey)) {
+           if (!KeyInfoT::isEqual(P->getFirst(), TombstoneKey)) {