Make use of MS-Windows native image API be selectable at run time

* configure.ac: Minor cleanup in how w32image.o is added to the
build when native image APIs are requested.

* src/w32gui.h (w32_load_image, w32_can_use_native_image_api)
(w32_gdiplus_shutdown): Move prototypes from w32term.h here, since
w32.c doesn't include w32term.h.
* src/image.c (struct image_type): No need to pass TYPE to the
'valid_p' method.  All callers changed.
(initialize_image_type) [HAVE_NATIVE_IMAGE_API]: Call
'image_can_use_native_api' before trying image-specific methods.
(image_can_use_native_api): New function.
(image_types): Remove the native_image_type parts.
(syms_of_image): New symbol 'native-image'.
(parse_image_spec): Accept native-image "type" for any image type.
* src/w32term.c (syms_of_w32term): New variable
'w32-use-native-image-API'.
* src/w32image.c: (w32_can_use_native_image_api): New function.
(gdiplus_init): Rename from w32_gdiplus_startup. Simplify code.
Move the call to GdiplusStartup to a separate function.  Use
ordinal number for SHCreateMemStream if cannot load it by name.
(w32_load_image): Ignore Win32Error status from
w32_select_active_frame.
Move DEFSYMs from here...
* src/image.c (syms_of_image) [HAVE_NATIVE_IMAGE_API]: ...to here.

* etc/NEWS: Update the entry about native image API use.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/w32.c b/src/w32.c
index 1d2a52b6df4..80178029bd0 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -10226,7 +10226,7 @@ term_ntproc (int ignored)
 
   term_w32select ();
 
-#ifdef HAVE_GDIPLUS
+#if HAVE_NATIVE_IMAGE_API
   w32_gdiplus_shutdown ();
 #endif
 }