Update pkgconfig file for the debian library
Initialize timeout earlier in x11 viewer

Previously any warning displayed at the top of the page
would never disappear because the display timeout being
set would be overwritten by the later initialization.
Raise CURL transfer size from 4KByte to 1MByte in X11 viewer

Previously, the overhead for the HTTP requests and responses
was too high, e.g. pdfref17.pdf would result in almost 8000
separate HTTP requests (but with this patch about 30.
Fix warning in debug message for CURL in X11 viewer
Print error when trying to open document without any pages
Fix 692171: Guard against .incbin on Intel's C compiler.