decklink: Fix MinGW warnings due to MSVC-specific pragmas

https://bugzilla.gnome.org/show_bug.cgi?id=794652#c7
diff --git a/sys/decklink/win/DeckLinkAPI.h b/sys/decklink/win/DeckLinkAPI.h
index 18a0c52..279946f 100644
--- a/sys/decklink/win/DeckLinkAPI.h
+++ b/sys/decklink/win/DeckLinkAPI.h
@@ -16,7 +16,9 @@
 */

 /* @@MIDL_FILE_HEADING(  ) */

 

+#ifdef _MSC_VER

 #pragma warning( disable: 4049 )  /* more than 64k source lines */

+#endif

 

 

 /* verify that the <rpcndr.h> version is high enough to compile this file*/

diff --git a/sys/decklink/win/DeckLinkAPI_i.c b/sys/decklink/win/DeckLinkAPI_i.c
index cd1e987..e69d976 100644
--- a/sys/decklink/win/DeckLinkAPI_i.c
+++ b/sys/decklink/win/DeckLinkAPI_i.c
@@ -18,7 +18,9 @@
 */

 /* @@MIDL_FILE_HEADING(  ) */

 

+#ifdef _MSC_VER

 #pragma warning( disable: 4049 )  /* more than 64k source lines */

+#endif

 

 

 #ifdef __cplusplus