add patch until upstream arm64 cross compilation is fixed

see nodejs/node#45756

recipes/arm64/run.sh

@@ -17,6 +17,40 @@ cd /home/node
 tar -xf node.tar.xz
 cd "node-${fullversion}"
 
+# see https://github.com/nodejs/node/pull/45756
+cat << "EOF" > correct-cflags.patch
+diff --git a/configure.py b/configure.py
+index a6dae354d4233..e2bb9dce12795 100755
+--- a/configure.py
++++ b/configure.py
+@@ -1247,9 +1247,7 @@ def configure_node(o):
+ 
+   o['variables']['want_separate_host_toolset'] = int(cross_compiling)
+ 
+-  # Enable branch protection for arm64
+   if target_arch == 'arm64':
+-    o['cflags']+=['-msign-return-address=all']
+     o['variables']['arm_fpu'] = options.arm_fpu or 'neon'
+ 
+   if options.node_snapshot_main is not None:
+diff --git a/node.gyp b/node.gyp
+index 448cb8a8c7cd4..6cec024ffe722 100644
+--- a/node.gyp
++++ b/node.gyp
+@@ -109,6 +109,9 @@
+     },
+ 
+     'conditions': [
++      ['target_arch=="arm64"', {
++        'cflags': ['-msign-return-address=all'],  # Pointer authentication.
++      }],
+       ['OS in "aix os400"', {
+         'ldflags': [
+           '-Wl,-bnoerrmsg',
+EOF
+git apply correct-cflags.patch --verbose
+rm -f correct-cflags.patch
+
 export CC_host="ccache gcc-8"
 export CXX_host="ccache g++-8"
 export CC="ccache aarch64-linux-gnu-gcc-8"