examples: Rename jpeglib example

Compiling jpeg.bas to a library/DLL/.so would produce some libjpeg.* files
confusingly similar to jpeglib's libjpeg.* binaries.

Furthermore, fbc prevents DLLs from linking against themselves, thus it's
impossible to compile a jpeg.bas to a DLL while using libjpeg. fbc always
removes the -ljpeg from the ld command line, thus there will always be
undefined references.
examples: Adjust jpeglib example to work with both fb and fblite dialects