Cleanup: take includes out of 'extern "C"' blocks

Surrounding includes with an 'extern "C"' block is not necessary anymore.
Also that made it harder to add any C++ code to some headers, or include headers
that have "optional" C++ code like `MEM_guardedalloc.h`.

I tested compilation on linux and windows (and got help from @LazyDodo).
If this still breaks compilation due to some linker error, the header containing
the symbol in question is probably missing an 'extern "C"' block.

Differential Revision: https://developer.blender.org/D7653

2 files changed, 2 insertions, 4 deletions

diff --git a/source/blender/imbuf/intern/oiio/openimageio_api.cpp b/source/blender/imbuf/intern/oiio/openimageio_api.cpp
index 6d3234771e7..df51aada5f0 100644
--- a/source/blender/imbuf/intern/oiio/openimageio_api.cpp
+++ b/source/blender/imbuf/intern/oiio/openimageio_api.cpp
@@ -35,7 +35,6 @@
 
 #include "MEM_guardedalloc.h"
 
-extern "C" {
 #include "BLI_blenlib.h"
 
 #include "IMB_allocimbuf.h"
@@ -43,7 +42,6 @@ extern "C" {
 #include "IMB_colormanagement_intern.h"
 #include "IMB_imbuf.h"
 #include "IMB_imbuf_types.h"
-}
 
 OIIO_NAMESPACE_USING
 
diff --git a/source/blender/imbuf/intern/oiio/openimageio_api.h b/source/blender/imbuf/intern/oiio/openimageio_api.h
index 520ad0c5da5..3dd089d65cb 100644
--- a/source/blender/imbuf/intern/oiio/openimageio_api.h
+++ b/source/blender/imbuf/intern/oiio/openimageio_api.h
@@ -24,12 +24,12 @@
 #ifndef __OPENIMAGEIO_API_H__
 #define __OPENIMAGEIO_API_H__
 
+#include <stdio.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#include <stdio.h>
-
 struct ImBuf;
 
 int imb_is_a_photoshop(const char *name);