Change prog, vao, and vbo to be GLuint arrays.
Change prog, vao, and vbo to be GLuint arrays.

Added a NPROGS_MAX define with the maximum number of shader programs
 ever needed to render a jpeg.
Changed prog, vao and vbo to be arrays of GLuint's of length
 NPROGS_MAX so that future jpeg decoders can use multiple framebuffer
 objects each with their own shader program.

negge/jpeg_gpu,negge/jpeg_gpu