Log Message:
xvidcore: Update to 1.3.6

Changes since 1.3.6:

 * Fix for a regression in initializing the Inter matrix with MPEG
   Quantization

Changes since 1.3.5:

 * Fix for various, long-standing and potentially critical security
   vulnerabilities in the decoder (credit to OSS-Fuzz)
 * Always use .text sections in nasm code for macho target

Changes since 1.3.4:

 * AmigaOS build patch by Fredrik Wikstrom
 * Support for applevel multithreading mode also for AVI output in
   xvid_encraw
 * Set interlacing flag in decoder correctly