Windows: Move building of blendthumb into the blender codebase.

Previously this was done in the deps builder due to the fact we needed
both 32 and 64 bit versions of this dll and CMAKE does not support that
in a single build folder. Now that 32 bit support has been dropped, this
can be safely moved into the codebase.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D5633

source/creator/CMakeLists.txt

@@ -820,18 +820,6 @@ elseif(WIN32)
     )
   endif()
 
-  if(NOT CMAKE_CL_64)
-    install(
-      FILES ${LIBDIR}/thumbhandler/lib/BlendThumb.dll
-      DESTINATION "."
-    )
-  endif()
-
-  install( # x86 builds can run on x64 Windows, so this is required at all times
-    FILES ${LIBDIR}/thumbhandler/lib/BlendThumb64.dll
-    DESTINATION "."
-  )
-
   install(
     FILES
       ${CMAKE_SOURCE_DIR}/release/windows/batch/blender_debug_gpu.cmd
@@ -1037,6 +1025,16 @@ if (WIN32)
   set_target_properties(blender PROPERTIES VS_GLOBAL_VcpkgEnabled "false")
 endif()
 
+# -----------------------------------------------------------------------------
+# Thumbnailer
+if(WIN32)
+  install(
+    TARGETS BlendThumb
+    COMPONENT Blender
+    DESTINATION "."
+  )
+endif()
+
 # -----------------------------------------------------------------------------
 # Setup launcher