make sure we always include jpeglib.h

--- dump_thomas.c
+++ dump_thomas.c
@@ -29,8 +29,8 @@
 
 #ifdef __cplusplus
 extern "C" {
-#include <jpeglib.h>
 #endif
+#include <jpeglib.h>
 
 int write_file_jpeg (char *file_name, unsigned char *data, int width, int height) {{{
   struct jpeg_compress_struct jpeg;