wrlib: moved 'RShutdown' from 'load.c' to 'misc.c' for consistency

The cleanup function is actually not specific to loading images and could
do a lot more, so it is probably better placed in 'misc.c'

wrlib/imgformat.h

@@ -75,6 +75,8 @@ RImage *RLoadWEBP(const char *file);
 
 #ifdef USE_MAGICK
 RImage *RLoadMagick(const char *file_name);
+
+void RReleaseMagick(void);
 #endif
 
 /*

wrlib/load.c

@@ -103,13 +103,6 @@ char **RSupportedFileFormats(void)
 	return tmp;
 }
 
-/* cleaning third-party libs at shutdown */
-void RShutdown() {
-#ifdef USE_MAGICK
-	MagickWandTerminus();
-#endif
-}
-
 static void init_cache(void)
 {
 	char *tmp;

wrlib/load_magick.c

@@ -86,3 +86,8 @@ bye:
 
 	return image;
 }
+
+void RReleaseMagick(void)
+{
+	MagickWandTerminus();
+}

wrlib/misc.c

@@ -26,6 +26,8 @@
 #include <X11/Xlib.h>
 
 #include "wraster.h"
+#include "imgformat.h"
+
 
 void RBevelImage(RImage * image, int bevel_type)
 {
@@ -240,3 +242,13 @@ const char *RMessageForError(int errorCode)
 		return "internal error";
 	}
 }
+
+/*
+ * cleaning third-party libs at shutdown
+ */
+void RShutdown(void)
+{
+#ifdef USE_MAGICK
+	RReleaseMagick();
+#endif
+}