Windows: fix error unknown type name 'HDC'

Caused by https://pdfium.googlesource.com/pdfium/+/fc790866bf26d977b2ea3a0c3938bb52895309ea

Author: bblanchon

patches/win/pdfium.patch

@@ -0,0 +1,15 @@
+diff --git a/core/fxge/cfx_renderdevice.h b/core/fxge/cfx_renderdevice.h
+index 8f427ce01..a4599e3a4 100644
+--- a/core/fxge/cfx_renderdevice.h
++++ b/core/fxge/cfx_renderdevice.h
+@@ -7,6 +7,10 @@
+ #ifndef CORE_FXGE_CFX_RENDERDEVICE_H_
+ #define CORE_FXGE_CFX_RENDERDEVICE_H_
+ 
++#if BUILDFLAG(IS_WIN)
++#include <windows.h>
++#endif
++
+ #include <memory>
+ #include <vector>
+ 

steps/03-patch.sh

@@ -59,6 +59,7 @@ case "$OS" in
     ;;
 
   win)
+    apply_patch "$PATCHES/win/pdfium.patch"
     apply_patch "$PATCHES/win/build.patch" build
 
     VERSION=${PDFium_VERSION:-0.0.0.0}