[PR PATCH] llvm12: fix build for gcc13

[oreo639 <oreo639@users.noreply.github.com>]

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There is a new pull request by oreo639 against master on the void-packages repository

https://github.com/oreo639/void-packages llvm12
https://github.com/void-linux/void-packages/pull/47920

llvm12: fix build for gcc13
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#### Testing the changes
- I tested the changes in this PR: **briefly**

No revbump since this just adds a missing include.

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A patch file from https://github.com/void-linux/void-packages/pull/47920.patch is attached

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From f031b812cd4811a14231cf1f8792ec75a5b0d422 Mon Sep 17 00:00:00 2001
From: oreo639 <oreo6391@gmail.com>
Date: Wed, 27 Dec 2023 00:29:48 -0800
Subject: [PATCH] llvm12: fix build for gcc13

---
 srcpkgs/llvm12/patches/llvm-gcc13.patch | 28 +++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 srcpkgs/llvm12/patches/llvm-gcc13.patch

diff --git a/srcpkgs/llvm12/patches/llvm-gcc13.patch b/srcpkgs/llvm12/patches/llvm-gcc13.patch
new file mode 100644
index 0000000000000..6895221b73bb7
--- /dev/null
+++ b/srcpkgs/llvm12/patches/llvm-gcc13.patch
@@ -0,0 +1,28 @@
+From ff1681ddb303223973653f7f5f3f3435b48a1983 Mon Sep 17 00:00:00 2001
+From: Sergei Trofimovich <slyich@gmail.com>
+Date: Mon, 23 May 2022 08:03:23 +0100
+Subject: [PATCH] [Support] Add missing <cstdint> header to Signals.h
+
+Without the change llvm build fails on this week's gcc-13 snapshot as:
+
+    [  0%] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/Signals.cpp.o
+    In file included from llvm/lib/Support/Signals.cpp:14:
+    llvm/include/llvm/Support/Signals.h:119:8: error: variable or field 'CleanupOnSignal' declared void
+      119 |   void CleanupOnSignal(uintptr_t Context);
+          |        ^~~~~~~~~~~~~~~
+---
+ llvm/include/llvm/Support/Signals.h | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/llvm/include/llvm/Support/Signals.h b/llvm/include/llvm/Support/Signals.h
+index 44f5a750ff5cb0..937e0572d4a725 100644
+--- a/llvm/include/llvm/Support/Signals.h
++++ b/llvm/include/llvm/Support/Signals.h
+@@ -14,6 +14,7 @@
+ #ifndef LLVM_SUPPORT_SIGNALS_H
+ #define LLVM_SUPPORT_SIGNALS_H
+ 
++#include <cstdint>
+ #include <string>
+ 
+ namespace llvm {