Fix Windows skia build

C:\lo\build\workdir\UnpackedTarball\skia\include/private/base/SkTemplates.h(125):
warning C5030: attribute [[clang::reinitializes]] is not recognized

Change-Id: I32649a4b6e7430fd9f74bfdcc0622c790568f0b7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/192802
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

external/skia/UnpackedTarball_skia.mk

@@ -42,6 +42,7 @@ skia_patches := \
 	0002-loong64-Honor-existing-LASX-LSX-settings.patch \
 	0003-loong64-Fix-missing-rounding-in-loong64-scaled_mult-.patch \
 	0004-loong64-Fix-the-remaining-implicit-vector-casts.patch \
+    msvc-unknown-attributes.patch.1 \
 
 ifneq ($(MSYSTEM),)
 # use binary flag so patch from git-bash won't choke on mixed line-endings in patches

external/skia/msvc-unknown-attributes.patch.1

@@ -0,0 +1,42 @@
+--- skia/include/private/base/SkTemplates.h
++++ skia/include/private/base/SkTemplates.h
+@@ -122,7 +122,9 @@
+     }
+ 
+     // Reallocates given a new count. Reallocation occurs even if new count equals old count.
++#ifndef _MSC_VER
+     [[clang::reinitializes]]
++#endif
+     void reset(size_t count = 0) {
+         *this = AutoTArray(count);
+     }
+@@ -210,7 +212,9 @@
+     }
+ 
+     /** Destroys previous objects in the array and default constructs count number of objects */
++#ifndef _MSC_VER
+     [[clang::reinitializes]]
++#endif
+     void reset(int count) {
+         T* start = begin();
+         T* iter = end();
+@@ -331,7 +335,9 @@
+     }
+ 
+     /** Resize the memory area pointed to by the current ptr without preserving contents. */
++#ifndef _MSC_VER
+     [[clang::reinitializes]]
++#endif
+     T* reset(size_t count = 0) {
+         fPtr.reset(count ? (T*)sk_malloc_throw(count, sizeof(T)) : nullptr);
+         return this->get();
+@@ -402,7 +408,9 @@
+     }
+ 
+     // doesn't preserve contents
++#ifndef _MSC_VER
+     [[clang::reinitializes]]
++#endif
+     T* reset(size_t count) {
+         if (fPtr != fTStorage) {
+             sk_free(fPtr);