dep/libchdr: Add option to transfer file ownership

dep/libchdr/include/libchdr/chd.h

@@ -256,6 +256,7 @@ extern "C" {
 /* CHD open values */
 #define CHD_OPEN_READ				1
 #define CHD_OPEN_READWRITE			2
+#define CHD_OPEN_TRANSFER_FILE 4 /* Freeing of the FILE* is now libchdr's responsibility if open was successful */
 
 /* error types */
 enum _chd_error

dep/libchdr/src/libchdr_chd.c

@@ -1528,7 +1528,13 @@ CHD_EXPORT chd_error chd_open_file(FILE *file, int mode, chd_file *parent, chd_f
 	stream->fclose = core_stdio_fclose_nonowner;
 	stream->fseek = core_stdio_fseek;
 
-	return chd_open_core_file(stream, mode, parent, chd);
+	chd_error err = chd_open_core_file(stream, mode, parent, chd);
+	if (err != CHDERR_NONE)
+		return err;
+
+	// swap out the fclose so that we close it on chd clost
+	stream->fclose = core_stdio_fclose;
+	return CHDERR_NONE;
 }
 
 /*-------------------------------------------------