Fixed pkg-config dependency for pdf2djvu
Removed unneeded configure script options for pdf2djvu

configure script didn't use "--disable-debug",
"--disable-dependency-tracking" options
Removed false-positive libDJVU tests fomr configure script

Removed false-positive libDJVU tests fomr configure script:
the provided djvu test samples failed false-positive
clang build warning for pdf2djvu

Clang currently does not have OpenMP support.
If built with clang, pdf2djvu ill not have parallel page rendering
support.
removed vim swp file
Added gitignore file