Fix build with jpeg-9. Bug # 520908

--- a/src/Image.cxx	2018-02-07 03:19:18.538699623 +0100
+++ b/src/Image.cxx	2018-02-07 03:20:15.105160934 +0100
@@ -29,11 +29,12 @@
 
 // Other libraries' include files
 #include <png.h>
-#include <jpeglib.h>
 
 // Our project's include files
 #include "misc.hxx"
 
+#include <jpeglib.h>
+
 // This is a constant representing "Not an Elevation" - it is
 // guaranteed to be less than any possible real elevation value.
 static const float NanE = -std::numeric_limits<float>::max();
@@ -266,7 +267,7 @@
     cinfo.in_color_space = JCS_RGB;
 
     jpeg_set_defaults(&cinfo);
-    jpeg_set_quality(&cinfo, quality, true);
+    jpeg_set_quality(&cinfo, quality, TRUE);
 
     jpeg_start_compress(&cinfo, TRUE);