external/skia: Missing include

...at least when building with Visual Studio 2022 Preview 17.4.0,

> In file included from workdir/UnpackedTarball/skia/src/core/SkKeyHelpers.cpp:14:
> workdir/UnpackedTarball/skia\src/core/SkShaderCodeDictionary.h(45,43): error: no type named 'string' in namespace 'std'
>     using GenerateGlueCodeForEntry = std::string (*)(const std::string& resultName,
>                                      ~~~~~^

etc.

Change-Id: Idd8dafb4e57e04088ee60954ecfa601cc7588e55
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/141833
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

external/skia/UnpackedTarball_skia.mk

@@ -39,6 +39,7 @@ skia_patches := \
     vk_mem_alloc.patch.1 \
     tdf148624.patch.1 \
     constexpr-template.patch.0 \
+    missing-include.patch.0 \
 
 $(eval $(call gb_UnpackedTarball_set_patchlevel,skia,1))
 

external/skia/missing-include.patch.0

@@ -0,0 +1,10 @@
+--- src/core/SkShaderCodeDictionary.h
++++ src/core/SkShaderCodeDictionary.h
+@@ -9,6 +9,7 @@
+ #define SkShaderCodeDictionary_DEFINED
+ 
+ #include <array>
++#include <string>
+ #include <unordered_map>
+ #include <vector>
+ #include "include/core/SkSpan.h"