also link to abseil on win

recipe/meta.yaml

@@ -19,6 +19,7 @@ source:
     - patches/0003-adapt-to-name-of-protobuf-lib-on-windows.patch
     - patches/0004-use-C-17-everywhere.patch
     - patches/0005-set-PROTOBUF_USE_DLLS-clean-up-other-symbols-on-win.patch
+    - patches/0006-explicitly-link-to-abseil_dll-on-windows.patch
 
 build:
   number: 0

recipe/patches/0001-do-not-link-msvc-runtime-statically.patch

@@ -1,7 +1,7 @@
 From cbe7b53095c6acf29abb65aee4b825f3235babf9 Mon Sep 17 00:00:00 2001
 From: "H. Vetinari" <[email protected]>
 Date: Sun, 4 Sep 2022 18:14:41 +0200
-Subject: [PATCH 1/5] do not link msvc runtime statically
+Subject: [PATCH 1/6] do not link msvc runtime statically
 
 ---
  python/setup.py | 4 ----

recipe/patches/0002-fix-paths-for-include-lib-directories.patch

@@ -1,7 +1,7 @@
 From db8c830280ee0cf0a853d24a2e634728e224813b Mon Sep 17 00:00:00 2001
 From: "H. Vetinari" <[email protected]>
 Date: Sun, 4 Sep 2022 18:42:34 +0200
-Subject: [PATCH 2/5] fix paths for include & lib directories
+Subject: [PATCH 2/6] fix paths for include & lib directories
 
 ---
  python/setup.py | 14 ++++++++++++--

recipe/patches/0003-adapt-to-name-of-protobuf-lib-on-windows.patch

@@ -1,7 +1,7 @@
 From e893d9d92207989b1cc917564518545dd5615143 Mon Sep 17 00:00:00 2001
 From: "H. Vetinari" <[email protected]>
 Date: Sun, 4 Sep 2022 19:42:16 +0200
-Subject: [PATCH 3/5] adapt to name of protobuf lib on windows
+Subject: [PATCH 3/6] adapt to name of protobuf lib on windows
 
 ---
  python/setup.py | 3 ++-

recipe/patches/0004-use-C-17-everywhere.patch

@@ -1,7 +1,7 @@
 From f5c19b6bcb953106ffa3852f930f9906d9577490 Mon Sep 17 00:00:00 2001
 From: "H. Vetinari" <[email protected]>
 Date: Thu, 18 May 2023 17:14:37 +1100
-Subject: [PATCH 4/5] use C++17 everywhere
+Subject: [PATCH 4/6] use C++17 everywhere
 
 ---
  python/setup.py | 4 +++-

recipe/patches/0005-set-PROTOBUF_USE_DLLS-clean-up-other-symbols-on-win.patch

@@ -1,7 +1,7 @@
 From 1d7c0d7885178f0cfd9caab881559cfbdd2013e0 Mon Sep 17 00:00:00 2001
 From: "H. Vetinari" <[email protected]>
 Date: Thu, 18 May 2023 18:49:27 +1100
-Subject: [PATCH 5/5] set PROTOBUF_USE_DLLS; clean up other symbols on win
+Subject: [PATCH 5/6] set PROTOBUF_USE_DLLS; clean up other symbols on win
 
 ---
  python/setup.py | 7 ++-----

recipe/patches/0006-explicitly-link-to-abseil_dll-on-windows.patch

@@ -0,0 +1,22 @@
+From 6261ee512478a6ba826243b368dd7d35527f5b14 Mon Sep 17 00:00:00 2001
+From: "H. Vetinari" <[email protected]>
+Date: Thu, 18 May 2023 19:20:35 +1100
+Subject: [PATCH 6/6] explicitly link to abseil_dll on windows
+
+---
+ python/setup.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/python/setup.py b/python/setup.py
+index 897191d7b..bdd67a457 100755
+--- a/python/setup.py
++++ b/python/setup.py
+@@ -338,7 +338,7 @@ if __name__ == '__main__':
+               glob.iglob('../third_party/abseil-cpp/absl/**/*.a'))
+     else:
+       # our windows builds don't follow standard windows naming (i.e. have a lib prefix)
+-      libraries = ['protobuf'] if sys.platform != 'win32' else ['libprotobuf']
++      libraries = ['protobuf'] if sys.platform != 'win32' else ['libprotobuf', 'abseil_dll']
+       if HasLibraryDirsOpt():
+         library_dirs = None
+       elif os.path.exists('../bazel-bin/src/google/protobuf/libprotobuf.a'):