patch llvm-project Signals.h

bring commit:
llvm/llvm-project@ff1681d
from llvm-project upstream.

ticket in apple/llvm-project:
apple/llvm-project#6847

0002-stdint.patch

@@ -0,0 +1,12 @@
+diff --git a/llvm/include/llvm/Support/Signals.h b/llvm/include/llvm/Support/Signals.h
+index 44f5a750ff5..937e0572d4a 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 {

PKGBUILD

@@ -33,6 +33,7 @@ source=(
     "swift-integration-tests::git+https://github.com/apple/swift-integration-tests#tag=${_swiftver}"
     "llvm-project::git+https://github.com/apple/llvm-project#tag=${_swiftver}"
     "0001-arch-aur-patches.patch"
+    "0002-stdint.patch"
     # swift src to check afterwards
     "indexstore-db::git+https://github.com/apple/indexstore-db#tag=${_swiftver}"
     "yams::git+https://github.com/jpsim/Yams#tag=5.0.1"
@@ -92,6 +93,7 @@ sha256sums=(
     'SKIP'
     'SKIP'
     'SKIP'
+    'SKIP'
 )
 
 
@@ -104,6 +106,7 @@ options=(!strip)
 
 prepare () {
     ( cd swift && patch -p1 -i "$srcdir/0001-arch-aur-patches.patch" )
+    ( cd llvm-project && patch -p1 -i "$srcdir/0002-stdint.patch" )
 }
 
 #pkgver() {