Feature/upgrade libjpeg (#1769)

* Upgrades dlib's included libjpeg to version 8d

* Overloads load_jpeg to read from memory buffer

* Removes "__inline__" define in jconfig, broke VC build

* Changes buffer size type to size_t

dlib/external/libjpeg/jerror.cpp → dlib/external/libjpeg/jerror.c

@@ -161,7 +161,7 @@ format_message (j_common_ptr cinfo, char * buffer)
   const char * msgtext = NULL;
   const char * msgptr;
   char ch;
-  int isstring;
+  boolean isstring;
 
   /* Look up message string in proper table */
   if (msg_code > 0 && msg_code <= err->last_jpeg_message) {